I know the concept of foreign films is subjective depending on where you are, but for the sake of the thread, foreign can be anything non-Hollywood produced if thats easier. For me, my favorite is a Belgian film called Man Bites Dog. Not only is it a great film, its one of the most disturbing movies Ive ever seen. None of the hollywood gorefest movies have anything on this one. Its filmed as a faux documentary where the crew joins and follows around a notorious gangster/serial killer named Benoit. After a while the crew are no longer witnesses to what he does, but accomplices as they join in. Its shot in black and white although extremely violent and realistic, which is why it was so disturbing. After watching it, I didnt know if tit was real or not, and had to look it up to be sure. Its tough to find in the US as its rated NC-17 by the MPAA, but if you can find it online or through Netflix, its fantastic.