Two Card Monte

This is an old classic. You have two cards,one face up and the other face down. Show the one card face up, and turn the cards over and show the other card. Do this a few times till they know the cards. Place them behind your back. Bring a card face down and let them guess what card is behind your back. When you bring it behind from behind your back they are always wrong. Or you can have them always be right. You get an extra set of cards. It’s a buy one get one free