Three and a half of Clubs trick
"Three And-A-Half of Clubs Trick The performer bets with a spectator that he can remove a card from the deck which has the same suit and exactly one-half of the value as the spectator`s selection. The spectator selects, uh oh...the seven of clubs. Imagine his suprise when you show him the three-and-a-half of clubs! Included are two, special three-and-a-half of clubs manufactured by the U.S. Playing Card Company, a die, and instructions for several effects."
Murphy's Manufacturing
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