I bet this happened to alot of us. What do you do when you ask the spectator to put there card back and you hold a break, and accidently lose there card for real? How to find the card? I know one method but it sucks. It takes 5 minutes to find it by counting. Can anyone tell me any sources how to control/locate the chosen card fast when you lose it?
That's happened to me a few times. The first thing I do is hand the deck out to be shuffled, just because you might as well take the opportunity to do it now when it doesn't matter. Then I get them to check that their card is still in the deck, and show it to any other spectators to prove it really is there. Often, while they're doing that, you'll get a glimpse of the card. Sometimes, and this is lovely, they can't find it, and you get credit for having made it disappear, at which point you casually take the deck back and ask them what the card was with a knowing smile, and say something like, "Are you sure it's vanished?", to reinforce the apparent effect, as you cull and steal it, followed by a revelation of your choice. When most laymen shuffle, they aren't technically brilliant, so they're pretty easy to track, so you should have a rough idea of where the card is even after the shuffle.
Essentially, it's just a chance to have fun, improvise, and see what the moment brings. You're pretty much in the same position as if you'd asked them to just think of a card, but with the bonus that it's feasible that you've already done something with the card. The best result I've had from this position came after I had a break and the spectator asked to shuffle the deck. I never refuse if that happens, but obviously it meant I lost the card, and didn't know what it was. He shuffled the deck, I took it back, said "Watch this", and turned over the top card. He freaked out. Of course, if he hadn't reacted, I'd have carried on my sentence, "Watch this, your card's not on top, it's somewhere in the middle," and done something different.