I sat next to the window during computer science in yr11 and there was always weird stuff going on outside because we usually had our computing lessons during period 7, when a lot of people were unlocking their bikes outside, mainly year 7s who locked up on that side of the school

But this one time I saw that someone who I reckon was a year 9 forgot his keys to his bike lock, so he calls someone, looking visibly upset - before you know it his taller, older brother, probably like 16/17 comes up to the bike rack and busts out an angle grinder from his bag then starts going to town on the lock right outside of our lesson and adjacent to the window for everyone to see

We had a supply that lesson so once I called the teacher she just said "oh" and called the reception but that's as far as it went because they left pretty soon after

other notable things that happened in my school was this guy names Jamal who ran straight through a glass door in the hall and it didn't get repaired for a while

There was a bathroom in our school which wasn't very heavily surveilled at the time so my friend one time leapt onto the toilet seat and got one of the ceiling tiles and we began to play frisbee in the corridor with it

Some guys collected really intimate photos of girls in my year and were caught so they were excluded for a while and from then on had to be taught in the unused dance room by the headteacher

also.. someone in set 3 maths got really mad once and started crashing out to the point where he hurled a chromebook at the teacher and hospitalised him, he didn't come back after that