DM: After many hard days of travel you reach Weathertop.
Aragorn: You know what guys? I'm thinking... screw that.
Frodo: Forget it. No way I'm climbing that thing.
DM: You are too weary to go on tonight. You must rest, and there's nowhere else around to make camp.
Frodo: We'll just sleep at the bottom of the hill then.
DM: You're so tired that the ground around here is not restful enough. You need to rest in the more comfortable area on top of the hill.
Frodo: Then we probably don't have the energy to climb the hill anyway.
DM: No, you have just enough energy to climb this hill, but not enough energy to go on or look for somewhere else to camp.
Frodo: That is a very specific level of tired.
DM: Maybe. Anyway, it's also dark now.
Aragorn: Hey guys, I have an idea. Let's camp on this huge hill tonight.
DM: Good idea.
Sam: Stupid DM.