If you have not seen the the movie Das Experiment or The Experiment you really need to rent it. It is german with english subtitles and stars the guy from Run Lola Run(another amazing movie). Its about 20 people who sign up to be either prison guards or inmates for 14 days. Its all fun and good for a bit and then it goes insane. The guards are evil bastards and let power consume them. Rent it. Subtitles are annoying but this movie is worth it.