Diablo Rojo

The Humboldt Squid, or Red Devil, is notoriously hard to photograph underwater-and notorious in general, for they can be aggressive during feeding, so much so that they sometimes eat each other.

(image found here: http://channel.nationalgeographic.com/series/wild/3365/Photos#tab-Photos/0 )

but i found an easier way: just hold your hand over a flashlight.