Hi. Years ago my dad had showed me a card trick. I'm not sure I remember every detail. It involved spreading the cards out, and telling the vaulnteer to pick a cars. Can't remember if it was just color or value and suit. At the end there was some reveal that showed they were choosing correctly. I want to say you showed the last card and it was the exact one you asked them to pick. Sorry for the garbage description. Obviously I'm not looking for anyone to reveal how it's done, just a name or a resource that might have some info. Thanks in advance.