This has got to be one of the strangest and scariest sea creatures I have ever seen. This fish, dubbed the Hatchetfish due to its hatchet-like thinness, is usually found in the Caribbean waters as well as the Gulf of Mexico.
The Hatchetfish has tube-like eyes that are permanently fixed upwards, giving them a scary look, but also helping them fish for food as it falls from above them. These fish are also equipped with light-producing photophores which are used in defensive behavior called counter-lighting. Basically, they can look like ghosts!