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A spectator is handed a small wooden board and three Brass cups. He is asked to take a dollar from his wallet, fold it and place it under one of the cups.
The magician or mentalist, has had his back turned throughout and yet can tell the spectator which cup his dollar is under.
A further climax comes when the spectator is asked to concentrate on the serial number of his dollar bill before he puts it away. Slowly the performer is able to call off the entire serial number.