Deep, Deeper, Deepo

This is a profound piece of work, for which a second viewing is nearly obligatory; there are a lot of things in the first viewing, for example, that might not be understood (this was the case for me, anyhow).

This is my take on it: In this movie, Donnie gets a chance to NOT DIE in his bedroom at the beginning, when the jet crashes into the house. He is allowed to live further into the future and he gets to see what would have happened. He is also exposed to the possibility of time travel; he chooses to take this option when he sees how his life (and the lives of his closest companions) will turn out if he stays on the planet. So he goes back to the day when the jet crashes into his bedroom; this time he makes sure he is THERE, in his bed, that night.

If you didn't understand this the first time you saw the film, watch it again. (And specifically listen to the lyrics that are playing when he falls into his bed at the end, smiling.)