The 2015 film, The Stanford Prison Experiment, is not a documentary of the experiment on power aggrandizement that took place in 1971; actors play the supervising professor s well as the 24 students who were the subjects—12 randomly being assigned as guards and the other 12 as prisoners. The film can be characterized as a psychological drama on human nature, given the salience therein of the will to power. Had Nietzsche been alive to watch the film, he would have been engrossed, finding much to confirm his theory that not only the will to power is the basic human motive, but also the weak too easily resort to cruelty (and pettiness) to feel any pleasure they can out of the exercise of whatever power they can muster, given their innate weakness.
The full essay is at "The Stanford Prison Experiment."