I'm not Sean, Source Code
First 5 minutes of Source Code, where Sean wakes up sitting across his girlfriend in a train on its way to Chicago. Except, he isn't Sean and he doesn't know the girl he's with. When he looks in the mirror he doesn't see his own face. He starts to freak out and then the train blows up.
Clip of the Duncan Jones latest movie with Jake Gyllenhaal.
