What is the documentary about a man being tortured by three men?

The documentary you’re likely referring to is "The Act of Killing," which explores the Indonesian mass killings of 1965-66 through the eyes of former perpetrators. While it doesn't center on a single man's torture by three men, it conveys the horrifying experiences of many victims and the psychological effects on the perpetrators. The film is notable for its unique approach, where the killers reenact their crimes in various cinematic styles. It raises profound questions about morality, memory, and the nature of evil.