I once saw a coach yelling balk all the time get hit in the gut with a wild pick off. The coach stopped yell and was ducking from then on. Kid didn't mean to hit him the coach he was behind the first base bag online with the pick off, coach never saw the ball coming till it hit him,
I heard one umpire warn a coach for interference for yelling balk all the time, kids were 9 and 10, PONY Mustang division. I liked that the young pitcher was having a hard time focusing because of the coaches antics.