Stab Happy (Gimmicks and Online Instructions) by Abstract Effects

The card stab reimagined for close-up in an entirely new and impossible way!

Your spectator selects and signs a card which then gets returned to the deck and the deck is shuffled, at which point you pull out your pocket knife and stab it through the edge of the deck, stabbing into the very edge between the fibers of a single card to reveal that you’ve managed to impossibly stab into their signed card!