Circus Card Trick
Circus Card Trick is an amusing swindle originally used by cardsharpers to fleece the unwary.
During a "find a card" effect, cards are dealt off the pack one at a time, face up, onto the table. After purposely passing by the spectator's card, the swindler wages that "the next card I turn over is your card". After the bet, he reaches into the pile of already dealt down face up cards, turns the correct card face down, and wins the money.
- Royal Road to Card Magic, page 138 (1949)