Go and see:

Primer. an independent film made in 2004 with a budget almost equal to zero. It won the Grand Jury Prize of the 2004 Sundance Film Festival. The story is about two young friends who are engineers and accidently discover how to travel through time after creating a strange device. They experiment with it and at first it seems harmless but as the story continues they use it on more dangerous aspects of life. Eventually they create complex paradoxes which will put their friendship to the test.

We thought it was a pretty confusing film, especially in the end where we had a hard time to follow the plot. But the topic and the refreshing way of filmmaking make it worth watching this weird movie. Definately if you are a fan of that modern science fiction genre. 8 out of 10!