GoldFish wrote:There is a more interesting version of the 21 card trick in David Blaine's book, Mysterious Stranger.
Quite possibly the only trick in there (as far as I can remember). He gives it saying something like 'it's the oldest trick there is'. Interestingly, try doing this:
1) Use Tarot cards (just the major arcana, and discarding the Death card '"To avoid accidents"), giving the excuse that the images have greater psychological strength, or imprint deeper, or some such.
2) Stress that they
mustn't tell you what column the card is in. I do this as though stopping them from helping me out accidentally. "DO NOT tell me which column the card is in. Please. There's a trick where you tell someone what column you cards in, then he deals them again, and you tell him again, and he deals then
again and you tell him
again... "(Shake your head and sigh here - almost everyone will have seen that trick) "This isn't like that. So, please don't blurt it out because you've seen that trick and think this works the same way. This is psychological. I am never going to ask you where the card is, at any point."
3) Slowly 'divine' the card, in three stages (first the column, then ask them to split the cards in that column into two piles - and you pick the correct pile - then the card itself) by picking up nonverbal cues (move their hand over the cards, move yours but while staring intently at their eyes, whatever).
Do that and, oldest trick or not, it plays as a rather strong, internally logical piece of mentalism.