I saw that movie not too long ago (german with english subtitles / available in english of course). This film is about a group of scientists recruiting a group of people to simulate a prison. The group is divided into two subgroups: guards and prisoners. The experiment is supposed to last 14 days or something like that. The whole thing is filmed and no violence is supposed to be used. Firstly, what we see is the prisoners not taking it seriously so they take advantage of the guards by making jokes, having fun, etc, like it's a big party. Secondly, we see the guards retaliating with more and more violence every day, and new ways of torturing the prisoners. A good movie about human nature. This is based on a true story. A must see imo.
