More ways to mess with the "Psychics"
Talk to the people in the foyer before the gig, and make up complete lies. Often, some of them are plants that will feed the lies back to the "psychic". Respond positively till half way through the reading, then express surprise that the spirits know about the pack of lies you made up.

If you get into a one-on-one reading, simply acknowledge all their guesses with a leading "OK...". Since they get no feedback from you, their cold reading techniques fail and they flounder terribly.

Have someone you know give you an old article that belonged to one of their relatives, that they know all about, but about whom you know nothing. Ask the psychic to read the item for you. See how much info they probe you for.
( Amish Information Systems hates misplaced, commas, Wed 30 Jul 2008, 12:45, Reply)