In football, theatricality is a way of convincing the referee of an opponent's foul. How should fair behaviour actually be defined, if the border between fair and unfair can be shifted by the player´s theatricality? The transaction of rules against theatricality is difficult, because the emotional expression is possibly justified, consequently judgement is speculative. This problem is analysed from interaction theoretic and moral philosophic point of view. Furthermore, existing data and possible solutions are discussed. It is concluded that willingness to play is important for the game. It encourages intensive tackling and supports game flow. Furthermore, it promotes the development of social effects, which are ascribed to the game.