In this scene Phillip Zimbardo flips a coin to see which group the participants will go into, heads is guard and tails is prisoner.
Prisoners lined up
Guards were allowed to make up prison rules, and press ups were used as a punishment.
Zimbardo's wife came in
Prisoners barricaded themselves into cells and guards forced in and strip searched the prisoners
Experiment shut down
Guards lined prisoners up along the wall and humiliated them infant of everyone, by making them do press-ups and stripping them down
Zimbardo showed his wife around the experiment and showed her what the guards were doing to the prisoners
Zimbardo's wife went mad at zimbardo for the torture that he was implying on the prisoners, and they had a huge argument which resulted in zimbardo shutting down the experiment