Finding Nemo/Nightmare Fuel

• When Bruce smells Dory's blood.
  • Dilated-pupils Bruce says "chompchompsnapgraaaarghsnapchompgraarg!!"
  • INTERVENTION!!!
• The barracuda that kills Marlin's family in the beginning.
  • The barracuda just hanging there in the water silently waiting to strike was pretty terrifying too. If you know anything about them they're basically torpedoes with razor-sharp teeth.
• That scene with the anglerfish.
  • "Good feelings gone."
    • It is scary enough to look at with all those teeth, but it's also a particularly aggressive hunter, especially after Martin. Later Played for Laughs considering how distracted and bubbleheaded Dory is acting, fully oblivious to how close to danger Martin is as she tries to read the address on the diver's goggles in the ravine.
• The jellyfish.
• Any shot of the sea when it isn't bright and friendly is pretty scary, especially to aquaphobics. Take Bruce's den with the "balloons", for example.
• When Marlin and Dory try to interact at a distance with a fish that seems small from said distance, it doesn't respond at all. It barely moves. Then, we get this:

Dory: Come on, little fella! Come on! Marlin: Dory, I'm a little fella. I don't think that's a little fella...

• • At which point, the 'little fella' turns around, revealing himself to be a giant freaking whale, before drifting out of sight for a few moments. While Dory tries to call after it, upset that it's vanished from sight, the view behind them shows a formless dark-blue silhouette looming up behind them...and then the whale is revealed to be looming up right towards them, its mouth opening to gobble them up!
    • Granted, the whale is revealed as intent on helping them out, but still, that scene is no less terrifying.
• Rage-mode Bruce is TERRIFYING. And his entrance isn't much better; the first we see of him is a load of massive sharp teeth.
• That scene at the end where they are in the fishing grounds. Just the cries and screams of dismay as the crowds of fish try to swim away from the net. and then knowing that they are going to be hauled up and die of suffocation. or worse, imagine if you were one of the fish that wasn't in the net but someone you knew or loved was.