I've only used one defusing comment that did not come from this board and that was two weeks ago. Both coaches had been chirping all game and my partner had told them as long as they controlled themselves we would be lax on enforcing the coaching box.
Early in the third quarter there was a crash on the baseline with me at trail on the table side, so i was between both coaches...a few feet on the floor. Just as the crash occurs the ball goes OOB on the baseline and my partner passes on the crash and awards the ball appropriately. Both coaches yell for a foul at the same time. Since it was a dead ball, I turn and say "Which one of you wants a foul called on his team cause you can't both be right." They look at each other and both grin. It actually got them to tone down the chirping, then the game got close and they were too busy to worry about us.
Not the best line, I know...but I'm a bean counter and supposedly we have no personality.