First reaction: WTF! This movie is just mindblowing..It's not as bloody as it first appears. The ending is uhm .. WOW!
Short summary: A guy wakes up in a bathtub filled with water, in a dark room. His leg is chained to one of the pipes in the room. There is another man, on the other side of the room, also chained to one of the pipes. A dead guy is lying in the middle of the room, holding a gun and a pocket recorder. Each man finds a small note in his pocket, together with a tape for the recorder. A voice on the tape explains their options and offers a way out. Go buy!!