Hand in the Bag trick
The magician displays four small "sand marbles" to the audience. Three of the balls are white and one of them is brown. All four are placed into a cloth bag and then mixed up by a spectator. Four members of the audience then each take one marble out of the bag and place it into their pocket sight unseen. Without asking any questions at all the performer knows which spectator has the brown ball!"
Released with Permission from Max Maven
Societe Francaise De Prestidigitation