Harvey is an old James Stewart movie where the main character has an imaginary friend who is a giant white rabbit. It's sort of a comedy.
Donnie Darko is a cult movie (dark comedy thriller) that came out in 2001: it stars Jake Gyllenhaal and is about a deeply disturbed teenager who has nightmarish visions about a gigantic, hideous rabbity creature.
I wonder how I missed Donnie Darko? both sound interesting.. but not for Max!