Rock-Paper-Scissors (also called Rochambeau) is a simple game played between two people using their hands.
The players make fists and say "Rock, Paper, Scissors" (or Ro-Cham-Beau); on the word "Scissors" (or after the word "Paper" depending on the rules) both players choose one of three hand signs, either a fist for 'Rock', the hand flat for 'Paper', or the middle and ring fingers extended for 'Scissors.'
The winner is chosen according to the following rules: Paper beats Rock, Scissors beats Paper, and Rock beats Scissors.
Rock-Paper-Scissors is often used as a method of tie-breaking. There are many variations of this game; one variation adds "lizard" and "Spock". In theory any variation using an odd number of options allows an equal number of winners and losers.