I watched "Primer" recently. It seemed straightforward enough for most of the movie, but by the end I had really no clue what was going on (but in a good way, I guess?). Before that, I watched "Timecrimes". It's in Spanish, but I watched with English dub because I am that guy. Anyway, it's not hard at all to follow, but I still found it kinda entertaining. Plus there's a reasonably hot naked chick, so it's got that going for it.