10 Card Tricks for the Novice Magician

Spread all your fifteen or twenty cards face-down on the table. Then say,
“Give me the Five of Hearts.”He picks out any card from those spread on the
table and, without looking at it (this is important!), hands it to you. You do
look at it. (It is the Ace of Spades, but he does not know that.) You lay it
face-down in front of you, and say, “Now give me the Ace of Spades.”