Dr. Zimbardo had wanted to make an experiment to study the roles people play in prison. He created an ad in the newspaper and gave everyone a psychological test he ended up with 18 college students and divided a group randomly by flipping a coin 9 prisoners and 9 guards. he gave the guards a talk and explained what they needed to do as guards.
The prisoners where given long dresses with no underclothes and assigned numbers they also wore a chain in their right ankle and covered their hair with a stocking cap. this was made to make them feel humiliated and emasculated like real prisoners do.
The guards started abusing their power and did creative punishments that included learning their numbers these where called counts. If they didn't do them according to how they wanted it they would punish them. These where made in the middle of the night or very early which deprived the prisoners from sleep.
Some of the prisoners started protesting against the fair treatment. One of these protests was in the second day of the experiment. The prisoners removed their stocking caps, ripped off their numbers, and barricaded themselves in their cells by putting their beds against the door.
The punishment for any thing that the guards considered was an act of rebellion or disobedience where put into the hole. One of the prisoners had had a mental breakdown because he had been put in the hole so many times. He and another prisoner where let go for too much stress causing them to have breakdowns.
While the Stanford Prison Experiment was originally made to be for two weeks it had to be stopped after just six days into the experiment. Dr. Zimbardo had realized that the guards started to be more and more abusive and the guards where showing more signs of stress and anxiety.