Midair Card Stab - John Kennedy
Have a playing card freely chosen and signed by a spectator, then bring out a small pocket knife and open the blade. "Watch closely." you say while starting to spring the cards into the air. Suddenly you plunge the knife into the falling cards and visibly impale the signed card in mid-air!
Mid-Air Card Stab looks incredible because your audience actually sees the card appear on the blade - it looks like you've performed a feat of incredible skill! This will completely fool both lay people and magicians.
At the conclusion of your performance the card can be given out as a souvenir and the knife can be examined without anyone having a clue as to how you did it! Mid-Air Card Stab comes complete with the special pocket knife and gimmick. Use your own deck of cards.