Are you talking about that one, in the alcatraz, with 4 kings, that Paul did? If you do, that is my favourite trick, and i do it all the time also.
Once i performed a simple sandwitch trick, and used teleportation presentation ("look, your card is going to teleport from the middle of the deck, in between these two aces"), and i just didnt pick up their card with the aces. So i tried to cover up by saying "Did you see it teleported? No? Thats because teleportation doesnt exist."