Johann Sebastian Bach

Bach used to teach a student choir whose members resented him because he was younger than a lot of them. As Bach walked home one day, a student carrying a large stick accused Bach of insulting his bassoon and, when Bach denied it, began hitting him. Bach managed to draw a sword he carried around for these types of situations, but the student wrestled Bach to the ground. The church that ran the choir later had a hearing and while the student got a mild reprimand for attacking his teacher, Bach got in trouble, too, for referring to the student as a "nanny goat bassoonist." (Ooh, burn.)