Stabbed & Shot 2 by Bill Abbott

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Direct from Bill Abbott's professional repertoire Stabbed & Shot is a killer card stab with a shot glass production that comes out of nowhere!
The Routine
You have a card is selected from a shuffled deck - signed - returned and deck is shuffled by a spectator. An empty paper bag is examined, and you toss the deck inside. A spectator is asked to shake the bag to mix the cards even further to make finding the chosen card even more impossible. A knife is produced and is stabbed into (and through!) the bag. Violently the knife is ripped from the bag and a single card is impaled on the end of the blade...it is the spectators signed selection!