Mistake Card Force
 

Effect:

A spectator names a number from 10 to 30 and the magician counts down to the card. Amazingly it matches the previously written prediction, or you have just forced a spectator to take a card that you already know what it is, so you can proceed with your own variation.

Secret:

You must pretend to mess up for this to work. Place the card that you want to force to them in the seventh position in the deck.

Ask them to name any number from 10- 30.

For example, they say 16.

Start counting cards down onto the table into a pile. One, two, three, four,...Keep counting but go past 16. 16 + 7 = 23. So go to 23 and say, "Whoops. I went to far...here you do it." Pick up the 23 cards and put them back on the deck.

Have them do exactly what you were supposed to do and when they get to number 16 that will be the card.