One tenet of the Umpires Code of Ethics is: "Co-operate and be professional in your association with your fellow umpires and do nothing to cause embarrassment". If you and a friend are at a game, after a controversial call, you must not be seen dissecting the play. You can't afford to show disapproval either verbally or with body language. Even if the call was the worst you have ever seen, you must remain silent.
Thanks to Geoff Robertson for the post.
