Four of the cards are blank on the front side. The 5th card has a picture of a chocolate chip cookie pictured on it. The cards are freely mixed so no one knows the exact location of the cookie card. The cards are then placed in a row, face down. Any spectator may change the order of the cards in the row.
Magician states the special mouse has extraordinary magical powers.
He will in fact find the chocolate chip cookie card. The mouse is wound up and placed in front of the row of cards. He walks down the row of cards and stops on one card. When the spectator turns over the mouse's selected card, it is the card with the chocolate chip cookie pictured on it. No magnets, shim cards or any electrical gimmicks.