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Fill the glasses. Focus secret
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Focus Description:
You ask two spectators to kneel opposite each other. With one hand, each holds his leg, in the other hand, each holds glasses, half filled with water. Invite them to have one of them, without changing position, pour water from his glass into his partner's glass.
Focus secret:
None of them will succeed, as their position will become unstable as soon as someone tries to bend down to pour water.
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