Just a Theory [SPOILERS]

Rating: Null/10 (19 November 2002)

I'm not going to review this because there are enough outlines of what happens on this page already, but I do have a theory about this movie.
My eventual interpretation of the movie was that Donnie had actually gone mad and the movie was one example of his reliving of the same month, which in his mind he was doing over and over again. The therapist explaining that Donnie was in danger of completely slipping away backs this up. Likewise, as pointed out in another review here, everything is perfect for Donnie, a fantasised reality. I believe Frank running over Joanie and Donnie shooting Frank is what triggered off his descent and he cannot live with the guilt so he has, in effect, killed off his true self and lives within his mind, reliving the events that led up to the death of Joanie and Frank.
It's just a theory, and ya gotta love movies that make you come up with theories.