Heads or Tails is a simple game, which consists of tossing a coin in the air and then checking which side was facing up after it fell. It is commonly used to choose between two alternatives or to resolve a dispute between two parties. This method of choice necessarily has only two possibilities of outcome, which have the same probability of occurring. A frequent use is the decision of who will make the initial move in an activity. In football, for example, the currency decides who gets the right to choose the field or the ball.