Nostradamus by Charles Gauci
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The performer shows a small board with 16 magnetic number tiles. Four spectators are each given face down tiles. The first spectator chooses the order for his tiles to be placed across the board. Each does the same in turn. The four resulting four-digit numbers are added. The performer shows his prediction written on a pad. It matches! He tears off the page, crumples it and drops it on the table. Once again, he distributes the tiles. Now, he takes one from each individual, repeating until the board is full. This set of numbers results in a new total. The performer picks up his original crumpled prediction, blows on it and opens it?his prediction has mysteriously changed to the new total! An impossible close-up number prediction, which will baffle the most astute audiences.