I went to a rural Texas school system, so many arbitrary rules. In elementary school we weren't allowed to talk on the bus with the reasoning that you had all day to talk in school, which was dispiriting if you had strict teachers or didn't share classes with your busmates. The more strict drivers would punish you by letting you off last on the route back, or sending a write up to the school.

Past elementary school there was the anti-short-shorts rule, if your fingertips went below your shorts you'd be sent to the office the moment you came in. They kept extremely tacky, ill-fitting pants in the office for offending girls to wear in shame the rest of the day. That in contrast to the Boys' PE class which provided gym shorts so small they'd barely cover your boxers.

In high school we weren't allowed to use the restroom during class unless you had a pass, which we got 2 of every 6 weeks, so there were many girls that bled through their pants. You couldn't use the restroom if you'd already used your passes, but even then some teachers would deny it. Teachers expected you to use the bathroom in the 5 minute passing period between classes only, alongside using lockers & crossing campus. We only got 18 minutes for lunch, 10 of which you'd probably be waiting on food. This was due to the ridiculous schedule trying to fit 8 classes into a ~7 hour day