Not so much a rule, but a new restriction. So, in my school, 8th grade classrooms were directly above the floor where 6th grade classrooms were. The classrooms on the upper floor were connected by what were essentially just concrete bridges. You could just jump from the upper floor corridors to the ground floor and skip the crowded stairs, but teachers were always on the watch. I guess they cheaped out.

So back when I was in 6th grade, I used to get bullied a lot. Like, the whole time. One day, I was in a particularly bad mood, as I was returning to my room just after the recess bell rang, from the upper floor to the ground floor. A kid decided it was a nice idea to grab my books and throw them down to one of his friends, where he could run away with it. The stairs were too overcrowded usually at this time, the complete recess could be over and you'd be stuck halfway.

So the guy ran up to me from behind, grabbed my books and threw them below, where his friend caught it as expected. Me being in a fuck-all bad mood, I just jumped straight down from the corridors, and much to the bewilderment of the guy below, caught him in just a second. Teachers went wild on me for that. I was called to the principal's office, threatened suspension, yada yada, but they didn't do anything in the end because I was good at studies - the whole reason for me being bullied.

Over the weekend, they removed the tiny railings and installed complete floor to roof bars to prevent anyone from dropping below. So yeah, I kind of changed a rule, depends on how you view it.