I recently re-discovered this mildly amusing demonstration of conformity on YouTube:
Apparently, leading social psychologists Stanley Milgram and Philip Zimbardo were both big Candid Camera fans. Milgram went on to conduct ethically questionable experiments that demonstrated the conditions under which we obey authority. Zimbardo's famous Stanford Prison Experiment had to be halted early because participants became so distressed at being required to role-play prisoners and guards in a mock prison.
At least Allen Funt, creator of Candid Camera, had the decency to just show people looking a bit silly in a lift.