Here's a memorably sad situation from last year. Boys sixth grade CYO. I do very little because its usually not worth the hassle. I do just enough so that the assignor usually gives me some of the diocesean championships. (BTW---around here CYO stands for Catholic Yelling Organization)
I am trail and player is stuck in the corner right in front of me trapped because he picked up his dribble. He held his pivot foot but was struggling to find a passing lane when his other foot stepped on the side line. Easy call. White! and we're going the other way. At which point a mother
jumped out of the stands from the fourth row and starts running towards me getting no less than six M-F's out of her mouth.
I didn't know if I was going to have to defend myself or what, but I stepped back onto the floor away from the sideline about two steps and just said loudly as I pointed towards the far end and the door, "just keep going ma'am".
It really shook me up though that someone would act that way at a sixth grade game. I wrote a letter to the diocese andcc'd the assignor and I guess the school got in hot water. I dropped the rest of my CYO games at that site.