MY GOD! I didnt think it could happen, I thought it was utterly impossible, but Ashton Kutcher actually played a dramatic role relatively WELL. With the support of people like Amy Smart, Kutcher's character becomes becomes believable and realistic.
Its a good movie, go see it.
Its about a child who writes down everything that happens in journals, to help supress memory blackouts. Later, he discovers as he rereads these journals he is teleported back to the moment he was writing about, and can change events.