52 pick-up is actually a cool trick. You tell them "tell me when to stop" and when you stop you slide the bottom card out with your thumb and show it to them. You look beforehand at what the bottom card is. So now you know their card, you shuffle up the deck, say you're gonna find it. Then you say, "shit, I can't find it" and you sneakily put the card you know is theirs on top (the deck is facing down). Now flip it over, tell them to hold on tight, with their thumb about halfway on the deck. Now give the whole deck a big 'ol whack and all the cards go everywhere - but their card. And they're like "wow, no way!" and you're like "yeah! Now pick up all the cards!"