Watched PRIMER last night for the first time last night and then 3 more times today. Very low budget film that was shot here in Dallas and won the SUNDANCE Film Festival a couple of years ago. Really messes with your head. Not an action film but a real thinking film. Best film I've seen in ages.
Word of warning..... If you are like me and the last 20 minutes left you a tad confused, check out the following site: www.primermovie.com especially the forum which has many theories on what happens and when in the film. There is also a timeline on the web that is a great help. However, do this after the film. You may also want to rewatch the thing again (its only 1hr and 17 minutes long) if so, I suggest you watch it with the director commentary. As with Donnie Darko, this was a huge help. A very cleverly written film made for next to nothing. Good luck!