Make this a game-specific trope, with the usual allowance for references to a game's rules in-universe,and lampshaded, discussed and invoked uses in a game mentioned within a work. Real Life games would be allowed, but no non-game-rule (laws, government regulations, accounting practices, payroll or recruiting limitations or the like) examples.
Make it In-Universe Only; that is, only examples like works where people are playing a game and commenting on its one weird rule, or games where the game itself calls out and acknowledges one rule as being weird.
Make this No Real Life Examples Please; please note that this would include cutting all real sports and real games unless they are mentioned within a work. (At present, this would leave three examples; two about the Leg-Before-Wicket rule in Cricket and one about Right-of-Way in fencing)