One of the most interesting decisions I ever saw was at Watford in the early seventies. A Watford player sent an easy back pass to his keeper, no opposing team player anywhere near. It managed to clip the ref’s heel and over the goalkeeper’s head for a goal. Surprise surprise two minutes later he gave a penalty to Watford where clearly no foul had been committed. To the credit of the other team, no-one complained, and the game continued at 1-1.