Inspired by another thread. What were ridiculous rules or procedures when you were at school or at your kid's school? We had a toilet paper monitor who handed out sheets of toilet paper. We had to specify number of sheets (up to three) in the communal area! Seemed totally normal to me at the time though! Another was boys in infants weren't allowed long trousers.
In seniors, a particular P.E. teacher would pull towels off people as they came out of the communal shower to check they had nothing on underneath and were wet. She single-handedly put a number of girls off sport and exercise at school. Awful.
In kid's (primary) school it's probably just practices that some schools still do, despite research showing little benefit of (and in some cases harmful) - pen licenses, behaviour RAG display, attendance awards, busywork homework etc.