Bigger Finish by Jay Sankey

A spectator selects a card and the card is returned to the pack. The spectator then FREELY CHOOSES four other cards and is asked if, by chance, the card she originally selected is among the four cards. It turns out that it is. She is given the four cards to hold in between the palms of her hands.
The magician asks her to concentrate on her card and to press her palms together as tightly as possible. When she separates her hands the four cards are found to have impossibly MELDED TOGETHER into a single jumbo playing card matching the card she had in mind!