I fully expect many of you to have seen it, but a shocking number of people haven't even heard of In Bruges. It's a quite fantastic dark comedy that I would highly recommend to anyone who hasn't experienced it yet.
In terms of movies I actually don't expect people to have seen, it's pretty rare to find someone who's actually seen Nosferatu (although everyone's heard of it). Other than that, there are a few documentaries--namely Scratch--that are really interesting, but I don't expect anyone here to have seen them because very few people watch documentaries and very few people here give much of a damn about hip-hop/DJing. On a related note, Wave Twisters.