Truth or Dare?: A Critical Madness

Mike Strauber, a businessman with a history of mental illness, walks in on his wife, Sharon, having sex with Jerry, his best friend. Mike storms off, and wanders aimlessly as he contemplates suicide while flashing back to his time with Sharon, and a childhood incident where he cut himself with a razor while playing truth or dare? Mike picks up a female hitchhiker, and the two go to a campsite, where they play truth or dare? The game turns violent, and ends when a park ranger finds Mike, who had mutilated himself at the behest of the hitchhiker, who was just a hallucination.