Die Welle

High school teacher Rainer Wenger (Jürgen Vogel) is forced to teach a class on autocracy, despite being an anarchist. When his students, third generation after the Second World War,^[2] do not believe that a dictatorship could be established in modern Germany, he starts an experiment to demonstrate how easily the masses can be manipulated. He begins by demanding that all students address him as "Herr Wenger", as opposed to Rainer, and places students with poor grades beside students with good grades – purportedly so they can learn from one another and become better as a whole. When speaking, they must stand and give short, direct answers. Wenger shows his students the effect of marching together in the same rhythm, motivating them by suggesting that they could really annoy the anarchy class, which is below them. Wenger suggests a uniform, to remove class distinction and further unite the group. Mona (Amelie Kiefer) argues it will remove individuality, as well. Karo (Jennifer Ulrich) shows up to class without the uniform and is ostracised. The students decide they need a name, deciding on "Die Welle" (The Wave). Karo suggests another name, which ends up with one single vote cast by herself.
http://en.wikipedia.org/wiki/The_Wave_(2008_film)