by user24 » Mar 4th, '11, 11:22
Only magicians care about what goes on under the hood. A simple bottom-of-deck-glanced keycard can leave your audience weeping if you present it well. Don't worry about how you do the trick, worry about what the audience sees.
One effect I like to do is to have them pick a card, then I cut so the keycard's on top (oh how boring!), then I say something like 'so we know your card is somewhere in the middle, but I don't know exactly where, what I'd like you to do is take the deck, find your card and hand me back your card with a few of the other cards either side, don't make it the middle card, just maybe three cards from one side and 6 from the other or something'. I like to keep the instructions precise enough that they do what I want, but vague enough that it seems like I'm making it up as I go along ("just, I don't know, a couple of cards from one side, couple of card from the other, and I'll see if I can pick your card out among them").
I keep a close eye to make sure they don't mess the order up (if they do, just do another trick with the cards they selected, you can explain that they picked a card, cut the deck and that chose which cards we'll use for this trick). Then I lay the packet of cards out face up (you can lay them out in any order so long as you pay attention to the keycard and remember which is theirs), take their hand, gaze mystically into their eyes and hover their hand over each of the cards.
Of course by this point you know which card is theirs, but it's the theatre of it all that makes it magical. If they seem to be enjoying it, stretch it out further - eliminate one card at a time with appropriate patter ("You relaxed a little as I moved this way, so I don't think you card is here, let's pass over these end three one more time. Yes I think I can safely get rid of this one") until theirs is the only card left.
Or if you just want a short trick, as them to extend their hand palm down, take their hand by the wrist, concentrate and then pass their hand over the cards once, and on the way back over the cards slam it (gently) down onto their chosen card.
It's nothing revolutionary, but it can have a powerful effect on spectators if you play it right - remember that they don't know how ridiculously simple the trick is. You can even use the same method twice in the same performance, with a completely different reveal, so long as you put effort into the performance, they'll never know it's the same trick. In fact it can even work in your favour; it's often said that your sleights should look exactly the same as your normal moves. So if all your pick-a-cards start the same way (free choice then cut) then there's nothing unusual about them, and so they're less suspicious - perfect!
Of course, performing for magicians would be entirely different.