Magic Card Trick 02

A rare trick, a monte rountine with normal cards, no gimmicks!
The magician displays three cards one at a time off the top of the deck. An indifferent card, and ace, and last but not least another indifferent card. The spec is asked to keep their eye on where the aces is. The magician them moves them around pretty slowly and then stops. He asks the spec to name which one they think the ace is. They are wrong!