Lots of deep sea creatures. It's kinda a phobia for me, too. Whenever I see underwater documentaries on the TV I have to pull my feet in because they give me the feeling they're about to get bitten off by something creepy.
Well spiders, snakes and most insects in general... tho I think they are all beautiful, but they still scare the crap out of me All of them are kind of mysterious like fejgkWENKW so scary