A United States Kennedy Half Dollar is used to predict the selection of a playing card.
The performer shows a half dollar and states that Kennedy will reveal the name of a card that will be selected. The coin is given to a spectator which they hold tightly clenched in their hand. When the selected card is revealed, the hand is opened to find that the half dollar now has a cut-out of the selected card!
You receive the precision cut coin (as pictured) for revealing the three of diamonds.