Years ago I worked with a guy who had a little brother still in school. Little brother was hyperactive and even with taking ritalin was still antsy and loud. Had to constantly make some kind of noise.

One day the school bus driver reached his limit, snatched the kid out of his seat and gave him a good shaking. Co-worker met the bus with his little brother the next morning. Told driver if he ever laid another hand on the kid, he'd " whoop his ass good," and went on to work. Within 2 hours the cops showed up and hauled co-worker off to jail for "making terroristic threats", a felony. He sat in jail for over a week and ultimately got probation, but faced up to 10 years.