(1) You set up 3 rows of 7 cards each, face up.

(2)You have someone come up and think of a card (not telling you what it is)

(3)You say the row's names: A, B, and C. He or she tells you which row.

(4)-----VERY VERY IMPORTANT PART----

Gather up the cards, but be sure to put the row they said INTO THE MIDDLE of the 3 piles. Lay the cards out again, like this. Deal three cards in a column, then the another three cards in a column next to the first. Deal the rest the same way, until you again have 3 rows of 7 cards each. Ask again which row. Gather the cards and repeat for the third time. (Remember to put their row in the MIDDLE of the pile.) The 3rd time, you know what card it is because when you ask them which row, it's the 4TH card in that row.

Here's another way to end it.

Say you will find their card. Shuffle, then flip cards into a face up pile, until you go past theirs. Say: "The next card I flip will be yours." They'll be thinking: "he/she doesn't know it went by already..." You amaze them by flipping over their card in the discard pile!