Primer
Think Film (2004)
Interesting concept of time travel.  I respect that writer/director 
Shane Carruth wanted the dialogue to be scientifically accurate, but...wow.  In his review for Esquire magazine, 
Mike D'Angelo said that "
anybody who claims to fully understand what's going on in Primer after seeing it just once is either a savant or a liar".  He's not wrong - the dialogue in this was way over my head.  I'm not usually a fan of remakes, but I wouldn't mind seeing a version of this that's a little easier to follow.