All joking aside, how many of us know the rules of Hockey? I am aware that the membership of this site includes players, umpires and supporters. I know everyone professes to know the rules inside out and upside down.
Ask any umpire, every player on the ground tells them regularly that they, the player, knows the rules better than the umpire does - a statement often uttered as the player is being shown a card or had a goal disallowed.