Brad Pitt and Edward Norton star in David Fincher's psychological thriller about an unnamed insomniac whose chance meeting with a charismatic soap entrepreneur spirals into the creation of an illicit bare-knuckle fighting ring. What begins as cathartic underground combat transforms into something far more sinister and ideologically complex. Based on Chuck Palahniuk's novel and adapted by Jim Uhls, this 1999 film deconstructs masculinity, consumerism, and identity through visceral action and narrative misdirection that has made it a cult classic.