How “The Amazing Gary” Did the Card Trick

Okay, so when we left off yesterday, I did I card trick involving finding a "mystery card" in the middle of a deck of cards. If you haven't seen the trick, here is the link:  The Amazing Gary- I'll wait while you watch it.

Boy, was that picture on the front page creepy or what?

Back already? Okay, here is how the trick is done...