A jaw-dropping two-card transposition that occurs between two spectators and in their hands!
A spectator (#1) shuffles the deck, selects a card, and the card is lost in the deck. The magician deals 3 cards into another spectator's (#2) hand - both spectators can see that the selected card is amongst those 3 cards.
The magician deals a "prediction" card (first seen face up) into spectator #1's hand. When the cards in spectator #2's hand are turned over, the selected card is gone! When spectator #1 turns over the "prediction" card in his hand, it has transformed into the selected card!