Deep sea creatures that should not exist

Barreleye fish

en.wikipedia.org

Has a see-through head. You can see its eyes inside.

Goblin shark

YouTube

The jaw. Look up the jaw. Actually, don't.

Frilled shark

YouTube

Dumbo octopus

YouTube

The one cute thing down there.

Anglerfish

National Geographic

Brings its own lamp.

Vampire squid

National Geographic

Giant isopod

National Geographic

A woodlouse the size of a cat.

Yeti crab

National Geographic

A crab wearing a fur coat.