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This trick works like clockwork: Grab a pencil and a clock, or watch, with numbers. Ask someone to secretly choose a number from 1 through 12. Then, you tap on the clock counterclockwise, starting on the 8. As you tap, your friend should silently count from his/her number up to 20 (one count for each tap). When your friend hits 20, you’ll be pointing at the number picked.
