Grotesque (Japan, 2009)

The doctor is one who's always gotten what he wanted; so he kidnaps a random couple, Aki and Kazuo, two young people who, after a few years working in the same office, go on a date once realizing feelings for one another. While on that first date, the couple is snatched off the street and wake up shackled in a basement. With little explanation, the doctor degrades, tortures, and mutilates them. As time and torture progresses, the doctor reveals that he is simply doing it for sexual stimulation and he wants them to survive.

Okay, this is basically an hour-long torture session. It features minimal narrative or story progress, and only presents the viewers with escalating levels of sadism and brutality. But still, the concept is so insane (and great) that I felt it should have a place on this list. Check out the Guinea Pig-series for more of these fake snuff-films, but those are way more extreme.

Genre: Crime/Horror