You show the spectator a deck of cards with lets say different names of people written on the backs. You spread though showing the backs with different names and say to them "which name do you thinks written on the 4 of diamonds?". They say "Paul" so you pull the card with Paul written on the back out. You then fan through showing the faces of the cards and say and "now which name do you think is behind the 10 of clubs". They say "Jason" You pull out the 10 of clubs. Now you are holding "Paul" and the 10 of clubs. You turn over Paul to reveal that they were right that is the 4 of diamonds and you turn over the 10 of clubs to reveal they were also right that had Jason written on the back

Sounds like David Acer's Nomen Omen.

Thanks Frank!