The Experiment is a 2001 German thriller film directed by Oliver Hirschbiegel, about a social experiment, based on Mario Giordano's novel Black Box, which resembles Philip Zimbardo's Stanford prison experiment of 1971. While reading a newspaper advertisement, taxi driver Tarek Fahd discovers an invitation to participate in an experiment, in which 4000 German marks are offered to the participants of the experiment, in which a prison situation is simulated. The experiment is led by Professor Klaus Thon and his assistant, Dr. Jutta Grimm. He decides to join in. Tarek participates as a journalist while wearing a pair of glasses with a built-in mini-camera. Tarek has a car accident shortly before the experiment, after which he meets a woman called Dora. She spends the night with him and Tarek keeps thinking of her, shown in flashbacks. The 20 volunteers are pronounced guards and prisoners, 12 prisoners and 8 guards, and are being observed by a team of scientists.