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First, introduce a red ball that you give to the exam.
Place it in your hand, this one will disappear to appear mysteriously inside your pocket.
Take it out then to show it again, then place it a second time inside one of your hands. The spectators saw you put it in one hand. Hold your fists in both hands, asking: What do you think is the red ball? Bets are launched!
Can the answers ... Open your hands, nobody could win because you only have one black bullet and one large red cube! No trace of the red ball!
A very visual routine and very pleasant to present because it will make laugh as much as it will bluff your spectators ...