Effect: You tell the difference between sweet and sour by means of an amazing mental ability.Secret: On a sheet of card write the words "SWEET" and "SOUR" and tear the card into nine pieces as shown.The pieces are dropped into a bag and mixed up. When you reach in and take a card, you know immediately whether the word on it is "SWEET" or "SOUR". This is possible from the way the card is torn. The "SOUR" pieces have only one straight edge. The "SWEET" pieces have two straight edges, with one exception which has no straight edges whatsoever.
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