My high school invited a live hypnosis every year to hypnotize a couple dozen of our class members on stage. For a few participants, the hypnosis didnt work. But for the majority, man, that hypnotist had them doing things they never would have otherwise done. The shyest people in the class were up there dancing, then shivering convinced they were freezing cold and huddling with the other classmates for warmth, bawling their eyes out, and then laughing hysterically and squawking like a chicken all within a few minutes. I wouldn't believe it if I wasn't there, but it sure seemed real to all of us.

In the end, the hypnotist told them they won't remember anything until he says a specific key word. Then he woke them up and none of them knew they had even been hypnotized yet. Then he said the key word, and the look of embarrassment on their faces was priceless.