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.