What's the stupidest rule your school ever enforced?

https://lemm.ee/post/1792668

What's the stupidest rule your school ever enforced? - lemm.ee

A private school I used to go to banned Listerine breath strips, the ones you put on your tongue, because too many kids were using them.
IIRC didn’t they have a small amount of alcohol or other chemical that kids would use too many of to purposely get drunk/high? Maybe I’m thinking of something else though
That’s true of mouthwash, but that seems impossible with breath strips. Like, both physically and financially impossible.