I got sent home from school in first grade after telling my teacher a new joke I liked. Both of my parents laughed quietly with each other as they took me home.
I only got sent home from school once. It was in the eighth grade. I wore the wrong socks. They had peace signs on them and the principal somehow thought that was offensive. My dad thought that was a stupid reason to make him come and get me, so the next day he got his revenge on the principal by sending me to school in a black T-shirt with a mushroom cloud behind the Denver skyline on it. The principal just glared at me all day without saying anything.
The principal was just being a jerk as usual. There wasn’t anything about peace signs listed in the dress code. He just made up his own dress code violations as he went along.