Ask someone to think of a number between 1 and 10. Then, have this person shuffle the deck, and count down to the number he/she thought of and remember that card. The cards are to be kept in the same position...not shuffled around during this counting; just counted. While the person is doing this, you can turn your back so that you can not see what they are doing.
After they have finished, you turn around, take the deck and place it behind your back. Count off 19 cards, reversing their order, and place them back on the top of the deck.
Then, bring the deck back in front of you and ask the person the number from 1-10 that they originally thought of. Begin your count with that number, dealing the cards out one at a time. When you reach 20 cards let that person name their card as you turn it over.