Scotch and soda (magic trick)

Scotch and Soda is a magic effect involving a copper coin and a silver coin which appear to transpose in the spectator's hands. The effect relies on simple gimmick and the tricks performed with it are self-working and require almost no skill. The trick is named after the cocktail Scotch and soda; the copper coin represents the "Scotch" and the silver coin represents the "soda".