To heighten the effect of a trick, as, for example, when a card is to disappear from the pack or to mark the passage of a card from one place to another, a crackling sound with the cards is sometimes introduced. It is made by holding the pack in the left hand, with the thumb at one side along the edge, the forefinger doubled under the pack and the other fingers on top at the opposite side, as shown in the illustration, Fig. 27. Now with the thumb the cards near the upper left hand corner are bent toward the inside of the hand. The bent forefinger which is under the pack, presses against the cards in the opposite direction. When the thumb lets the cards escape again the rebound of the cards to their normal position will produce a peculiarly sharp, explosive sound.