Shell game
（重定向自Thimblerig）
The shell game (also known as Thimblerig, Three shells and a pea, the old army game) is portrayed as a gambling game, but in reality, when a wager for money is made, it is almost always a confidence trick used to perpetrate fraud. In confidence trick slang, this swindle is referred to as a short-con because it is quick and easy to pull off.