While in SoCal, I visited my aunt, uncle, and cousins. We watched Source Code as a compromise between no horror films (me) and nothing "boring"(19- and 21-year-old male cousins).
I'm partial to both time-travel and alternate-reality stories, and this was a bit of both. Jake Gyllenhaal plays an Army vet who is part of a government security experiment: he must re-live the final 8 minutes of a doomed train until he finds its bomber and prevents a second attack. At the same time, he's trying to find out how he got to be part of the situation. There are some pretty big, gaping holes in the plot - but other than that it's a decently engaging (if somewhat predictable) movie.