Whenever the movie theatre is shown, look at the movies playing. One of them is "The Last Temptation of Christ", a movie in which Jesus lives in a world where he wasn't crucufied and sees what would have happened had he not died. Sort of the same idea as "Donnie Darko". Donnie experiances the 28 days as they would have occurred had he not died when the engine crashed into his room on October 2nd. Had he not died he would have caused his mother and Gretchen's death.