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Using posthypnotic suggestion, they get him to behave like their comic-book superhero, making the principal switch between Krupp and Captain Underpants with a dash of water in his face.

Raz then ended the hypnosis session, leaving each person with what is called a posthypnotic suggestion—an instruction to carry out an action while not hypnotized.

No. Told them those were Dr. Al's posthypnotic suggestions.

A special code phrase in the message had released "Stanley Martin" from the posthypnotic suggestion that had held him for so long.

Many times the subject falls asleep while giving himself posthypnotic suggestions.