I remember learning about this in college. It had a profound impact on me, because I realized then that, at the time, I probably would have been one of the vast majority. Awareness of the experiment and its implications — along with some sobering, honest self-awareness — profoundly changed how I viewed the world.

Here’s the rundown of the Milgram Experiment.

The subject was given the title teacher, and the confederate, learner. The participants drew slips of paper to ‘determine’ their roles. Unknown to them, both slips said “teacher”, and the actor claimed to have the slip that read “learner”, thus guaranteeing that the participant would always be the “teacher”. At this point, the “teacher” and “learner” were separated into different rooms where they could communicate but not see each other. In one version of the experiment, the confederate was sure to mention to the participant that he had a heart condition.

The “teacher” was given an electric shock from the electro-shock generator as a sample of the shock that the “learner” would supposedly receive during the experiment. The “teacher” was then given a list of word pairs which he was to teach the learner. The teacher began by reading the list of word pairs to the learner. The teacher would then read the first word of each pair and read four possible answers. The learner would press a button to indicate his response. If the answer was incorrect, the teacher would administer a shock to the learner, with the voltage increasing in 15-volt increments for each wrong answer. If correct, the teacher would read the next word pair.

The subjects believed that for each wrong answer, the learner was receiving actual shocks. In reality, there were no shocks. After the confederate was separated from the subject, the confederate set up a tape recorder integrated with the electro-shock generator, which played pre-recorded sounds for each shock level. After a number of voltage level increases, the actor started to bang on the wall that separated him from the subject. After several times banging on the wall and complaining about his heart condition, all responses by the learner would cease.

At this point, many people indicated their desire to stop the experiment and check on the learner. Some test subjects paused at 135 volts and began to question the purpose of the experiment. Most continued after being assured that they would not be held responsible. A few subjects began to laugh nervously or exhibit other signs of extreme stress once they heard the screams of pain coming from the learner.

If at any time the subject indicated his desire to halt the experiment, he was given a succession of verbal prods by the experimenter, in this order:

1. Please continue.
2. The experiment requires that you continue.
3. It is absolutely essential that you continue.
4. You have no other choice, you must go on.

If the subject still wished to stop after all four successive verbal prods, the experiment was halted. Otherwise, it was halted after the subject had given the maximum 450-volt shock three times in succession.

Most expected that fewer than 3 percent of the those in the test would inflict the maximum voltage.

But fully 65 percent, or 26 of 40, administered the experiment’s final massive 450-volt shock. Only one guy refused to go above 300. Subsequent tests maintain this same percentage — nearly two in three obey the authority figure to the bitter end.

In the version I saw, one student refused to take part at all.

I can never know what I would have done in this experiment now that I’m aware of it. It’s ruined for you now, too.

But that doesn’t mean you can’t learn from it.