Donnie Darko is a troubled, yet genius young man who has schizophrenia, and stops taking his medication. He sees a large rabbit, who is named Frank, who tells him to do bad things. At the beginning of the film, he narrowly escapes death due to sleepwalking the night before, and at the end of the film, has to choose between time traveling back to his own death or the death of his loved ones.
This film is convoluted and becomes more so as the film goes on, weaning Donnie off his medicine, and introducing Frank, his imaginary friend. With black holes, and extended conversations discussing both matter and God, this film creeps up on you and leaves you with chills long after the credits roll.