The Effect: Six kids are invited onto the stage to hold six matching envelopes. Another child is asked to stand up and pick a number from one through six. The leader counts to that envelop and asks the child holding it remove the paper inside. It says, "You will choose THIS one!" As you make a big deal about how you 'predicted' that choice in advance, the kids will start to suspect that every envelope has the same "You will choose THIS one" inside. So you have all the other kids open their envelop and to the amazement of your audience, each of the other five have a paper inside that says, "You will chose THAT one!"

The Secret: 

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