Milgram experiment
Before Milgram did his experiment, he asked fourteen Yale University psychology students what they thought the results would be. On average, the students thought that 1.2% of the "teachers" would give the biggest electric shock of 450 volts. In fact, in Milgram's first set of experiments, 65 percent (26 of 40) of participants gave the final massive 450-volt shock, and all gave a shock of at least 300 volts.