The movie to watch now is Das Experiment, which is based on two real social experiments.
There are many such experiments going on right now.
In most cases with involuntary participation.
Not really in labs.
And on a much larger scale.
And not so benign either.
Sooner or later the results are going to be visible.
Even if neither the participants nor the perpetrators want them to be.
They have a habit of moving out of control.
P.S.: The documentation says no violence (whatever that means) allowed.