Hi,
Fish don't come much wierder than those that live in the deep sea. Behold:

And the ever-frightening fish of my nightmares, the Viperfish

What makes most of these fish even weirder is the bioluminescence used by their bodies. Oh, and did you know that angler fish males are about a centimeter long and live permanently attached to a female Angler fish, which feeds it it's entire life?
Thanks,
Manga