Two men awaken from unconsciousness in a large, dingy bathroom. They are chained to opposite ends of the room, and between them is the body of a man who has apparently blown his own brains out. The younger of the two men, Adam (screenwriter Leigh Whannell), is a photographer; the older, Lawrence (Cary Elwes), is a doctor. Both have envelopes in their pockets containing microcassettes, and Lawrence's also has a single bullet and a small key. It's a trap set by a man known as Jigsaw, who singles out people whom he feels don't properly appreciate life, and places them in closed settings that require either self-mutilation or the murder of another person in order to escape. Scored by Nine Inch Nails' Charlie Clouser, James Wan's movie is for those who already own the bootleg, uncensored cuts of NIN's videos and think Natural Born Killers wasn't sufficiently bloodthirsty. It's brutal horror, where anyone can die at any time, and gorehounds will love it. Average folks may find it too intense.