Just finished Coherence.
Wow. If you got lost during Primer this flick will rape your mind.
It's a indie sci-fi/mystery. The idea that a comet would cause what happens to happen in the movie is pretty lame but once you get beyond that it pulls you in. For about the 1st third of the movie you don't know if it's aliens, time travel, ghosts, etc...
http://coherencethemovie.com/