I did that to a coach once in a basketball game.
It was 5-7 year olds and we were told to be "liberal" with calling walks. Well there was about 7 seconds left in the quarter (non stop running clocks) and a kid traveled before he even got across the half court line. Naturally, I start to blow my whistle (had taken it out for a second from coughing), and the coach of the other team (40+ year old mother) yanked the ball, on the court, from this 5 year old kid almost knocking him down, and held the ball out to her player to throw it in.
I let the clock run out, went over, let her talk to her team for a second, and after they started to go out she sat down, and I squatted to get on eye level with her and said "I'd say its never happened before in an under 7 year old league, but if you even say one word to a kid on the other team after what you just did, I will not only throw you out of this game, but I'll do everything I can to make sure you don't coach in this county on any level."
I didn't call a technical because it was my first day in that league, and to be honest, I never saw anything like it before or since.