Rules of the Internet

This a Just For Fun page

"Rules of the Internet" is a loose collection of rules and aphorisms spawned by the infamous 4chan Image Board. Depending on who you ask, they are either not meant to be taken seriously or very Serious Business. Most of them don't apply except for within the community they originated from, and the list is continuously changing but through Memetic Mutation a handful have become well known.

Some of the more notable rules^[1] include:

Rule 🕑: IT'S TIME TO STOP!
Rule nonumber: There are no hard-and-fast Rules on UseNet, only Guidelines, which are more or less strictly enforced (and differ) from group to group; this is why it's generally wise to read any group for a bit before ever posting to it.
Rule i: Just as the square root of -1 is imaginary, so too are half the things you see on the internet.
Rule -1: /b/ is not your friend.
Rule Use-0: There is no C*b*l. There is, however, a net-wide conspiracy designed solely to lead Dave Hayes to believe that there is a C*b*l.
Rule 0: Don't fuck with cats
Rule Use-1: Spelling and grammar counts. So do grade, wit, and a sense of humor (the latter two are different), as well as a willingness to meet odd people, but these are lesser considerations.
Rule 1: You don't talk about /b/.
Rule 1.21: 1.21 gigawatts?! See Rule 88
Rule Use-2: The Net interprets censorship as damage and routes around it. (John Gilmore)
Rule 2: You DON'T talk about /b/.
Rule 2.1: ALWAYS Speak /c/.
Rule 2.2: Remember 2nd Place.
Rule 2.3: It Doesn't Matter! I Missed...
Rule 2.4: AGAIN?! WHAT THE HECK!
Rule 2.5: If Anyone Asks About /b/ You Don't Know Anything.
Rule 2.6: If it's funny, it came from 4chan or Something Awful.
Rule 2.7: On IG Reels and CoD lobbies, everyone has every pass. No exceptions.
Rule e: Roflcopter Makes You Look Like A n00b.
Rule e.2: To The Power Of Negative X Over Lambda.
Rule e.e: My ROFLcopter Goes Soi Soi Soi.
rule 1 2: if it exists, there's oatmeal of it
Rule Use-3 ("Why 3?" "Because we felt like it"): For every opinion there is at least one equally loud and opposing opinion.
Rule 3: We are Anonymous. On The Internet Everyone is Anonymous.
Rule 3.3: VALVe hates the number 3.
Rule 3.5: If you are an idiot, you will be made fun of.
Rule 3.141592653589793238462643383279502884197169399573105: Expect Us.
Rule abc: Omegle is Epic and so is Tumblr
Rule Use-4 (Godwin's Rule): Any off-topic mention of Hitler or Nazis will cause the thread it is mentioned in to an irrelevant and off-topic end very soon; every thread on UseNet has a constantly-increasing probability to contain such a mention.
Rule 4: We are legion.
Rule 4.5: Nobody cares if you're tough in real life.
Rule Use-5 (Reimer's Reason): Nobody ever ignores what they should ignore on Usenet.
Rule 5: We do not forgive, we do not forget.
Rule Use-6: Don't post to misc.test unless you understand the consequences. (Eddie Saxe)
Rule 6: Anonymous can be a horrible, senseless, uncaring monster.
Rule 6.5: There is no rule 6.
Rule 6.241592653589793238462643383279502888394338799146210..: Didn't Expect Them!
Rule 7: Anonymous is still able to deliver.
Rule 7.5: If it exists, you can buy it online somewhere.
Rule 7-B: There is no topic so thoroughly covered that no one will ever bring it up again.
Rule 8: There are no real rules about posting.
Rule 8.5: It all happened At least 100 years ago.
Rule Use-9: It's always September somewhere on the Net.
Rule 9: There are no real rules about moderation either - enjoy your ban.
Rule 9.3: Brazilian girls will do it for 500 dollars.
Rule 9.5: If you enjoy any rival sites - DON'T!
Rule ⑨: There is a Touhou version of it. No exceptions.
Rule 10: /b/ is not your personal army.
Rule 10.5: It needs more DESU. No exceptions.
Rule 10.6: Fuck Gaston.
Rule 11: No matter how much you love debating, keep in mind that no one on the internet debates. Instead they mock your intelligence as well as your parents.
Rule 11.1: Anything You Say, No Matter How Truthful Or Carefully Picked, WILL Be Deemed Wrong If The Majority Is Against You.
Rule 11.2: If A Site Looks Serious It Doesn’t Mean It’s A Trusted Site.
Rule 11.3: You will get viruses from downloading pornography.
Rule 12: Anything you say can and will be used against you.
Rule 13: Anything you say can and will be turned into something else.
Rule 13.5: It never needed any more cowbell.
Rule 14: Do not argue with trolls - it means they win.
Rule 14.5: As long as there is internet there will be drama.
Rule 15: The harder you try, the harder you will fail, fall, die trying.
Rule 15.3: Burger King foot lettuce. The last thing you want on your burger king burger is someone's foot fungus.
Rule 15.5: If a camwhore posts, tits must be shown. If this rule is broken, said camwhore must GTFO.
Rule 16: If you fail in epic proportions, it may just become a winning failure.
Rule Use-17: Go not to UseNet for counsel, for they will say both 'No' and 'Yes' and 'Try another newsgroup'.
Rule 17: Every win fails eventually.
Rule 18: Everything that can be labelled can be hated.
Rule 18.5: If someone is better than you, they are hacking.
Rule 19: The more you hate it, the stronger it gets.
Rule 19.5: Lense Flare makes masterpieces.
Rule $19.99: The internet isn't free. It just has an economy that makes no sense to capitalism. (Brad 'Squid' Shapcott)
Rule 20: Nothing is to be taken seriously. (EXCEPT RULE 71!)
Rule 20.2: Because Nothing Is A Serious Matter. Everything Else Isn't. No Exceptions.
Rule 20.3: Except For Rule 2719hex.
Rule 20.4: You're doing it wrong.
Rule 20.20: Rainbow Dash Is About 20% Cooler Than You.
Rules 21: Original content is original only for a few seconds before it's no longer original.
Rule 21.5: If your girlfriend ends in .jpg, she's not real.
Rule 22: Copypasta is made to ruin every last bit of originality.
Rule 22.5: Long stories are copypasta.
Rule 23: Copypasta is made to ruin every last bit of originality.
Rule 23.5: Long stories are never read at any rate.
Rule 23.6: It's Moarfing time
Rule 24: Every post is always a repost of a repost.
Rule 24.5: Pics or it never happened.
Rule 25: Relation to the original topic decreases with every single post.
Rule 25.5: Everyone sees what you did there.
Rule 26: Any topic can be easily turned into something totally unrelated.
Rule 26.5: Nobody know the answer to "What is love?".
Rule Use-27: In cyberspace, everyone can hear you scream. (Gary Lewandowski)
Rule 27: Always question a person's sexual prefrences without any real reason
Rule 28: Always question a person's gender - just incase it's really a man
Rule 28.5: If it TRULY is a girl, then this is an INCEPTION!!! Only way out is to die, so look at Chuck Norris the wrong way.
Rule Use-29: No rational discourse can happen in a thread cross-posted to more than two newsgroups.
Rule 29: On the internet, all girls are men, and all kids are undercover FBI agents.
Rule 29.5: Do a barrel roll.
Rule 30: There Are No Girls on the Internet
Rule 30.1: Rule 30 Only Applies To The Deep Internet.
Rule 30.2: If Girls Are Found On The Deep Internet, CODE RED, RED ALERT, ALL SYSTEMS BREACHED!
Rule 30.3: Everyone is gay for Bridget.
Rule 31: Tits or GTFO—the choice is yours.
Rule 31.5: The internet is for porn.
Rule 32: You must have pictures to prove your statements/Anything can be explained with a picture.( Not Ai art)
Rule 32.5: All Your Pictures Were Obviously Photoshopped. No Exceptions.
Rule 32.6: I Can Tell From Some Of The Pixels And From Having Seen A Lot Of Shops In My Day.
Rule 32.7: The Shadows Are ALL WRONG! Definitely Photoshopped.
Rule 32.8: Any line can be interpreted with a sexual connotation. No exceptions.
Rule 32.9: Everything is a fetish, no exceptions.
Rule 32i: I'm Cool. See Rule i.
Rule 33: Lurk more - it's never enough
Rule 34: If it exists, there is porn of it. No exceptions.
Rule 34.1: If it exists, there's an anthropomorphic humanized version of it.
Rule 34.2: There Are Ponies Of It. No Exceptions.
Rule 34.3: If It Exists, There's An App For It.
Rule 34.4: If It Exists, There Is A YouTube Of It.
Rule 34.4x2: If It Exists, There Is A LEGO Of It.
Rule 34.5: If It Isn't In Minecraft, There Is A Crafting Idea Video Of It.
Rule 34.6: If It Exists, There Is A Parody Of It On YouTube.
Rule 34.7: If It Exists, There Is A Pokémon Based On It.
Rule 34.8: There Is Dubstep Of It, No Exceptions.
Rule 34.34: Everything IRL Is On The Internet.
Rule 34.99: There Is A Mario Paint Composer Version Of It.
Rule 35: If no porn is found of it, it will be made. (try to do it with a chinese cartoon, I dare you)
Rule 35.1: If there's no anthropomorphic humanized version, there will be.
Rule 35.2: If No Pony Is Found Of It, It Will Be Made.
Rule 35.3: If There Is No App For It, It Will Be Made.
Rule 35.4: If No Poop Is Found, It Will Be Pooped.
Rule 35.4x2: If There Is No LEGO Of It, Then Make One.
Rule 35.5: If It Is In Minecraft, The Crafting Idea Video Will Be Shoved Into The Farthest Corners Of YouTube.
Rule 35.6: If There Is No Parody Of It, Make One.
Rule 35.7: If There Is No Pokémon Based On It, There Is/Will Be An Anymon Based On It.
Rule 35.8: If No Dubstep Is Found Of It, It Will Be Made.
Rule 35.35: If It Is Not On The Internet, It Will Be By Midnight.
Rule 35.99: If No Mario Paint Composer Version Is Found Of It, It Will Be Made.
Rule 35∞: The Number Of Objects And Situations Yet To Be Porn-ified Spontaneously Decreases Over Time.
Rule 36: No matter what it is, it is somebody's fetish. No exceptions.^[2]
Rule 36.3: There will always be more fucked up shit than what you just saw.
Rule 36.5: Bringing up Nazis is insta fail.
Rule Use-37: Read the thread from the beginning, or else. (Faisal Nameer Jawdat)
Rule 37: You cannot divide by zero (just because the calculator says so).
Rule 37.2: Xero Chance Can Divide By Zero.
Rule 37.3: Don't watch AOK without knowing the CAPSLOCK on the video title. (Rule 39)
Rule 38: No real limits of any kind apply here—not even the sky.
Rule 38.5: A cat is fine too.
Rule 39: CAPS LOCK IS CRUISE CONTROL FOR COOL.
Rule 39.5: One cat leads to another.
Rule 40: EVEN WITH CRUISE CONTROL YOU STILL HAVE TO STEER
Rule 40.5: Another cat leads to zippocat.
Rule 40.6: Ceiling cat is watching you fap.
Rule 41: Desu isn't funny. Seriously guys. It's worse than Chuck Norris jokes.
Rule 41.3: Saturday is Caturday.
Rule 41.5: Always bring your towel. No exceptions.
Rule 42: Nothing Is Sacred.
Rule 42.5: It is a delicious cake. You must eat it.
Rule 43: The more beautiful and pure a thing is - the more satisfying it is to corrupt it.
Rule 43.5: It is a delicious trap, you must hit it.
Rule 43.6: Someone would fap to it.
Rule 44: If it exists, there is a version of it for your fandom... and it has a wiki and possibly a tabletop version with a theme song performed by a Vocaloid.
Rule 44.3: /b/ sucks today
Rule 44.5: Even One Positive Comment About Japanese Things Can Make You A Weaboo.
Rule 44.6: Cock goes in here.
Rule 44.7: Snape killed Dumbledore.
Rule 45: Someone has died because of the internet
Rule 45.3: When one sees a lion, one must get into the car.
Rule 45.5: All lasers must be charged before shooping da whoop.
Rule 45.6: They will not bring snacks.
Rule 45.7: There Is Always Furry Porn Of It.
Rule 46: The internet is SERIOUS FUCKING BUSINESS.
Rule 46.5: Always bring your towel. No exceptions.
Rule 47: The pool is always closed.
Rule 47.3: You will never have sex.
Rule 47.5: !???
Rule 47.7: It will always need moar sauce.
Rule 48: Profit
Rule 48.3: Anything can be a meme.
Rule 48.5: If it exists, someone's gonna get mad at it. No exceptions.
Rule 49: No matter what it is, it is somebody's fetish.
Rule 49.3: You need E-degrees in E-Lawery and E-psychology to be an internet badass.
Rule 49.5: Rule 34 is actually Producing Documents, Electronically Stored Information, and Tangible Things, or Entering onto Land, for Inspection and Other Purposes. DON'T TRUST THE WEEBS AND SIMPS! I SEE YOU FUCKING WHORES!
Rule 50: A Crossover, even improbable ones, will eventually happen in Fan Art, Fan Fiction, or official release material. No exceptions!
Rule 51: Longcat is Looooooooooong.
Rule 51.5: The Baby Mammott Was Always Happy
Rule 52: If you get RickRoll'd, you must watch the entire video.
Rule 52.5: He Made a ARG ARC
Rule 53: If a country is not specified in a post, it is expected that the poster/commenter is in the US because that is the center of the universe.
Rule 56: If it exists, There is a minecraft mod of it.
Rule 61: Chuck Norris is the exception to Rule 63, no exceptions or else.
Rule 62: It has been cracked and pirated. No exceptions.
Rule 63: For every given male character, there is a female version of that character (and vice-versa). Including Chuck Norris. Rule 61 is lying to you. And there is always porn of that character. No Exceptions.
Rule 63.3: For every character, there is a princess form from the Super Crown, No Exceptions. Bowsette is a constant.
Rule 63.5: Don't copy that floppy.
Rule 64: If it exists, it has “LOOOOORRRREE!".
Rule 65: If there isn't, there will be.
Rule 66: The longer the LORE around something is, the weirder it gets.
Rule 67: If it has lore, it also has lore from alternate timelines(AU), especially if the main lore is copyrighted by a big power hungry corporation.
Rule 67/2: 90% of fanfiction is the stuff of nightmares.
Rule 68: Everything has a fandom, everything.
Rule 68.5: If a fandom exists, you can find it on RōBLOX. No exceptions.
Rule 69: If it exists, put it in a bunny outfit (the sexy one)
Rule 69.2: Nice!
Rule 70: Do not talk about the 100M GET failure.
Rule 70.5: For every character, there is or will be a cat (and/or kitten play) version of them.
Rule 71: The internet is SERIOUS FUCKING BUSINESS.
Rule 72: If a song exists, there is a Megalovania version of it.
Rule 73: If it exists, someone's made a duck out of it
Rule 74:
Rule 75: Rule 75 is a lie. OH SHI-
Rule 77: The internet makes you stupid.
Rule 78: If something is popular, there's brainrot of it.
Rule 78.5: There is a Wiki of it. No exceptions.
Rule 79: If something is popular, and there's no brainrot of it, it's coming soon.
Rule 80: Gore is always present on the internet.
Rule 80.5: Yes, even in porn.
Rule 81: Wherever there is a screen the lorax will be seen.
Rule 82: VALVe does not make trillogys.
Rule 83: get bite-of-87ed
Rule 84: Deltarune will ALWAYS be tomorrow
Rule 84.3: Also Silksong.
Rule 84.5: nvm they're both out
Rule 85: If it exists, there is a pony of it. No exceptions.
Rule 86: If it exists, you can play Bad Apple on it. No exceptions.
Rule 87: Do not speak of the diner.
Rule 88: 88 miles per hour! See Rule 1.21
Rule 90:Every anime sure have jojo referenced,No exceptions.
Rule 93: If it exists, you can play DOOM on it. No exceptions.
Rule 94: Every person is Trans until proven otherwise.
Rule 96: PORTAL is becoming the new DOOM
Rule 97: The cake is a lie. No exceptions.
Rule 101: If it exists Equinox 101 can beat it. Grug is the exception as beating equinox 101 rhymes with grug
Rule 103: For every song, there is a Vocaloid version of it.
Rule 104: If there is not a Vocaloid version of it, there will be. No exceptions.
Rule 104.5: Every Miku is canon.
Rule 105: Rule 71 is SERIOUS FUCKING BUSINESS.
Rule 108 (from the soc.motss FAQ): "What will happen to me if I read soc.motss?" "In general, nothing. (You may be informed or infuriated, of course; but that's a standard Usenet hazard.)"
Rule 123: 456789.
Rule 143: you loved her, you killed her.
Rule 177: Tropicana tastes like rainbow. No exceptions.
Rule 169?: Nah, I'd rather have 2 69s.
Rule 190: The only good hentai is yuri, that's how the internet works. Only exception may be vanilla.
Rule 191: Rule 190 is a lie.
Rule 210:Chinese cultural products(anime,cartoon,manhua) is exceptions of rule 34,63(before I tell to they).
Rule 222:If there is the opportunity to make a Will Wood reference, then make a Will Wood reference.
Rule 227: Comparing two things is normal, but if compared too often it becomes unhealthy and toxic.
Rule 250: The more famous something is, the more people will try to bring it down with or without reason.
Rule 269: Yeah, finally...2 69s!
Rule 284: What has been seen cannot be unseen. Even the post clearance that's coming up.
Rule 317: "and everybody clapped"
Rule 317.5: #trustmebro
Rule 386: If it's white and has a black circle in the center, then it's Minos Prime.
Rule 369: Dairy simps for Moch.
Rule 399: Oh yeah? But can you do this?
Rule 404: VPNs don't protect you.
Rule 420: most people are high on the internet, some exceptions.
Rule 469: Overwatch = porn
Rule 647: Keldeo is a pony.
Rule 666: Old alt groups never die. They don't fade away nicely, either.
Rule 753: Rule 97 is a lie.
Rule 1999: There's a SpongeBob clip for every situation, No Exceptions.
Rule 1 2 7 3: Down the Rockefeller Street!
Rule 2000: Liek if u cri evrytim
Rule 2006: cock joke
Rule 2007: everything you say here is private
Rule 2007.5: TF2 stands for Team Fortress 2 and NOTHING ELSE. No exceptions.
Rule 2010: nothing you say here is private
Rule 2019: The Backrooms shouldn't be turned into brainrot. No exceptions.
Rule 2018: most people here are morons
Rule 2020: InCoNsIsTeNcY is eveRyWhErE
Rule 2023: william afton moment
Rule 2028: Nobody can count to 3
Rule 2028.5: Especially VALVe
Rule 2031: Do it for the vine
Rule 2036: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
Rule 2401: L is Real. No exceptions.
Rule 2719hex: =)
Rule 4784: Everything rhymes with Grug, Except for losing.
Rule 5196: Wally West solos everyone, except for Robin. No exceptions.
Rule 6000: The Beast was better before he gave money away.
Rule 9001: It's over 9000!!! No exceptions.
Rule 8999: It's..under 9000??? Some exceptions
rule 1991: goku doesn't solo
Rule 10000: If a game exists, there is mods.
Rule 10001: If there are no mods, there will be.
Rule 2015: There is only ONE right way to play Undertale, no exceptions.
Rule 4967: NickyTV must kys.
Rule 90120: Applying your standards to someone else's post will result in a Flame War.
Rule 999999: theres THREE right ways to play Undertale, no exceptions.
Rule x^2: FAQs are asked frequently. Get used to them.
Rule N/A: Anonymous does not truly exist, it never really has. This is especially true now when everybody has accounts with there names, but it was even true in the old days of anonymous on 4chan, if you said or did something that someone doesn't like, they will find out who you are and where you live. No exceptions.
Rule ∞: 01010100 01101000 01100101 00100000 01101001 01101110 01110100 01100101 01110010 01101110 01100101 01110100 00100000 01101001 01110011 00100000 01100110 01110101 01101100 01101100 00100000 01101111 01100110 00100000 01110011 01110100 01110010 01100001 01101110 01100111 01100101 00100000 01100011 01101111 01100100 01100101 01110011 00100000 01100001 01101110 01100100 00100000 01110000 01110101 01111010 01111010 01101100 01100101 01110011 00100000 01110100 01101000 01100001 01110100 00100000 01110101 01110011 01110101 01100001 01101100 01101100 01111001 00100000 01110101 01101100 01110100 01101001 01101101 01100001 01110100 01100101 01101100 01111001 00100000 01101010 01110101 01110011 01110100 00100000 01101100 01100101 01100001 01100100 00100000 01110100 01101111 00100000 01101110 01101111 01110100 01101000 01101001 01101110 01100111 00101110 00100000 01000001 01101100 01110011 01101111 00100000 01110111 01101000 01111001 00100000 01100100 01101001 01100100 00100000 01111001 01101111 01110101 00100000 01100100 01100101 01100011 01101111 01100100 01100101 00100000 01110100 01101000 01101001 01110011

"Rules of UseNet"[]

An older set of such rules exists, generated well before 4chan by the denizens of UseNet. Among its entries are:

Rule nonumber: There are no hard-and-fast Rules on UseNet, only Guidelines, which are more or less strictly enforced (and differ) from group to group; this is why it's generally wise to read any group for a bit before ever posting to it.
Rule 0: There is no C*b*l. There is, however, a net-wide conspiracy designed solely to lead Dave Hayes to believe that there is a C*b*l.
- Corollary: here are no pods.
Rule 1: Spellling and grammer counts. So do grace, wit, and a sense of humor (the latter two are different), as well as a willingness to meet odd people, but these are lesser considerations.
Rule 2: The Net interprets censorship as damage and routes around it. (John Gilmore)
Rule 3 ("Why 3?" "Because we felt like it"): For every opinion there is at least one equally loud and opposing opinion.
Rule 4 (Godwin's Rule): Any off-topic mention of Hitler or Nazis will cause the thread it is mentioned in to an irrelevant and off-topic end very soon; every thread on UseNet has a constantly-increasing probability to contain such a mention.
- Quirk's Exception: Intentional invocation of this so-called "Nazi Clause" is ineffectual.
- Case's Corollary: If the subject is Heinlein or homosexuality, the probability of a Hitler/Nazi comparison being made becomes equal to one.
Rule 5 (Reimer's Reason): Nobody ever ignores what they should ignore on Usenet.
Rule 6: Don't post to misc.test unless you understand the consequences. (Eddie Saxe)
Rule 7-B: There is no topic so thoroughly covered that no one will ever bring it up again.
Rule 9: It's always September, somewhere on the Net.
- Dave Fischer's Extension: 1993 was The Year September Never Ended.
Rule 17: Go not to UseNet for counsel, for they will say both 'No' and 'Yes' and 'Try another newsgroup'.
Rule $19.99: The Internet isn't free. It just has an economy that makes no sense to capitalism. (Brad 'Squid' Shapcott)
Rule 27: In cyberspace, everyone can hear you scream. (Gary Lewandowski)
Rule 29: No rational discourse can happen in a thread cross-posted to more than two newsgroups.
Rule 37: Read the thread from the beginning, or else. (Faisal Nameer Jawdat)
Rule 108 (from the soc.motss FAQ): "What will happen to me if I read soc.motss?" "In general, nothing. (You may be informed or infuriated, of course; but that's a standard Usenet hazard.)"
Rule 666: Old alt groups never die. They don't fade away nicely, either.
Rule 90120: Applying your standards to someone else's post will result in a Flame War.
Rule x^2: FAQs are asked frequently. Get used to them.

Rules of the Internet is the Trope Namer for:

Tropes associated with the Rules of the Internet:

Complete Monster: Rule 6 says this about Anonymous.
Crossover: Rules 50 and ⑨ (which is sufficiently enforced for Touhou to get its own page of these) Also, as much as some of us might hate it, 85. Indeed, rules 85 and ⑨ have intersected (with there being ponies of the actual Touhou characters). More recently, there have also been humanized ponies drawn in Touhou-styled outfits, or ponies cosplaying as Touhou characters.
Epic Fail: Rule 16
Four Is Death: Rule 4
Exactly What It Says on the Tin: Rule 9001 is "It's over 9000!!! No exceptions."
Homage: Rules 1 and 2.
Hypocritical Humor: Rule a and Rule b. Also, Rule i.
l33t l1ng0: Rule 0.96
Memetic Mutation: Everywhere
Mouthful of Pi: Rule 3.14159265358979323846
Screw the Rules, I Make Them: Rule 9
Shaped Like Itself: Rule 9001

↑ For values of "notable" that are extremely arbitrary, but being referenced elsewhere helps
↑ "Officially" Rule 51, but generally cited as Rule 36; the alternate Rule 36 is (in polite terms): "No matter how messed up what you've just seen is, there is always worse." Considering the originators of the list, this ties in quite nicely.

[1] For values of "notable" that are extremely arbitrary, but being referenced elsewhere helps

[2] "Officially" Rule 51, but generally cited as Rule 36; the alternate Rule 36 is (in polite terms): "No matter how messed up what you've just seen is, there is always worse." Considering the originators of the list, this ties in quite nicely.

[1]

[2]