Clear Deception - Card in Clear Box
Displaying a large envelope, you explain to your audience it contains two items: a single jumbo card and a packet of normal-size cards in a clear plastic box. You show the items, not revealing the face of the jumbo card.
The spectator then selects and notes one of the cards from the box, returning it to the packet. When asked to name the card aloud, the jumbo card is revealed...to be a wrong prediction!
"Impossible!" you cry, and search for the selection among the packet in your hand, only to find it has VANISHED from your packet and returned to the BOX!