Sorcerer's Nudibranch (Polycera atra)

This is a species I've seen many times, first when I start scrubbing boats in the Santa Barbara harbor. Only ever really found them on wharfs and harbors. Never seen one on a natural reef but I know they're there. These guys are so cool they feed on bryozoans, the white encrusting box looking stuff in the last shot. One of my favorites.

[@keegan707]

... do a trick!