This effect was used by David Blaine to open one of his TV specials! He borrowed a watch from a man sitting in his car and checked the correct time. He placed the watch back in the man's hands and then asked him to think of a number to move the time. The man said '24' and after a few seconds of mental hocus-pocus, the man opened his hands and saw the watch indeed MOVE AHEAD 24 MINUTES! The reaction was incredible!

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