Elementary school principal banned talking at lunch. If you were caught talking or even signing to someone, you had to go sit by yourself on a folding chair with no table.
There was once my mom came to eat lunch with my older sister and I. The principal was like " Oh you should go eat out in the hallway with your daughters" and she was like "nah, I'm gonna sit here with my daughter and her friends and talk to them and enjoy their presence" (usually if a parent came for lunch the student could invite one friend to join, unless you had siblings. Then it was too many people so you couldn't invite a friend). Anyway, one of my older sister's friends whispered to my mom that she was going to move so she wouldn't get in trouble for talking. THIS WAS A NINE YEAR OLD.