A demonic, imaginary rabbit seen by
Donnie often in the movie "
Donnie Darko." Told Donnie to burn things, destroy things, etc. in order to save the world. Donnie, by the way, was a victim of Schizophrenia. In the end, it turns out Frank is really a teenager who Donnie shoots, and comes back in the past as the bunny, which is a
halloween costume. All very confusing.