Rock-Paper-Scissors

Rock-paper-scissors (also known as paper-scissors-rock, scissors-paper-stone, jan-ken-pon, rochambeau (sometimes spelled roshambo) and many derived terms), is a popular two-person hand game. The game is often used as a selection method in a similar way to coin flipping, drawing straws, or throwing dice to randomly select a person for some purpose. However, unlike truly random selections, it can be played with skill if the game extends over many sessions, as a player can often recognize and exploit the non-random behavior of an opponent.