" What’s fascinating is that most guards in the Stanford Prison Experiment remained hesitant to apply ‘tough’ tactics at all, even under mounting pressure. Two-thirds refused to take part in the sadistic games. One-third treated the prisoners with kindness, to Zimbardo and his team’s frustration. One of the guards resigned the Sunday before the experiment started, saying he couldn’t go along with the instructions. Most of the subjects stuck it out because Zimbardo paid well. They earned $15 a day–equivalent to about $100 now–but didn’t get the money until afterwards. Guards and prisoners alike feared that if they didn’t play along in Zimbardo’s dramatic production, they wouldn’t get paid. But money was not enough incentive for one prisoner, who got so fed up after the first day that he wanted to quit. This was prisoner number 8612, twenty-two-year-old Douglas Korpi, who broke down on day two (‘I mean, Jesus Christ […] I just can’t take it anymore!’21). His breakdown would feature in all the documentaries and become the most famous recording from the whole Stanford Prison Experiment. A journalist looked him up in the summer of 2017.22 Korpi told him the breakdown had been faked–play-acted from start to finish. Not that he’d ever made a secret of this. In fact, he told several people after the experiment ended: Zimbardo, for example, who ignored him, and a documentary filmmaker, who edited it out of his movie. "
― Rutger Bregman , Humankind: A Hopeful History