The Monterey Bay Aquarium has come up with a wonderfully creative set of Halloween e-cards inspired by horror movie posters and their own aquatic residents who, when cast in the right light, make for some truly frightening nightmares. From vampire squid and ghost shrimp, to moon jellies and wolf eels, you'll find it tough to pick just one to send off to your friends. What on Earth is a  bloody belly comb jelly?