This has suddenly brought back a memory from my football days as a kid. Our U-10 team used to train indoor at a local sports hall with 5 a side goals. For a laugh once, we did a Kids v Dads game.
There was, of course, one dad who took it way too seriously and was shoulder barging 9 year olds full force into the walls. A few dads told him to "chill out, Mick" but he insisted "It's a man's game" and carried on. After a few minutes of kids literally running away from the ball when he was nearby, his final act was to volley the ball into the face of the 9 year old goalkeeper, which nearly ended up in a fist fight with the kid's dad.
He got his son and went home in a strop, and neither was ever seen again.