Just some classics:
For four years in Maths class, we played a game using pea shooters. Who could shoot a ball of paper closest to the teacher's head without them realising?
Or every time the maths teacher writes a seven on the board, everyone stands up. When she turns around, you crawl under your desk. We managed to do this for two weeks without getting caught.
Um, regular water/food fights in toilets or cantine.
Constantly correcting teachers.
I went through four years of history class without writing a single thing down.
In front of the whole class, I stood up and had a go at the technology teacher, calling him a lazy tw*t and saying that he isn't competent enough to teach. He sent me to the deputy head's office. She agreed with me.
I had a fight with a guy in my class and there were two teachers trying to restain me, I knocked one of them out.
Going into class drunk.
Constantly getting kicked out of English/ History/ Maths.
Setting off fireworks in corridors.
The funniest thing was probably the last day of year 11, in Physics, the whole class sung "We will rock you" at the top of our lungs and the entire school heard.
Smoking in school.
Spending hours riding up and down the elavator.
Carved my name in every desk in the free lesson hall (there are 63 of them).
Flooded the bathroom above principal's office and her office.
In French class, we all chucked our pens/whole pencilcases out of the window one by one, and when she asked why none of us were writing all said "Well, we don't have any pens miss".
Playing musical chairs.
In technology class, every wednesday for a year, four of us would sit at the back of the class eating bicuits, crisps, drinking coke, eating cake, smoking... We got caught once and he bummed a fag.
Strip tease / strip poker / strip foosball in the common room.
On the last day of year 11, the whole year dressed in blue shell suits, with hard hats, horns, sirens... and caused mayhem. We the did a conga line through the school/playground. Everyone was drunk or stoned. It got so bad that they called the police and they came with a couple of riot vans.
I'm not sure what the worst thing was, I've forgotten so many.
Over my four years of secondary school, I got a weeks suspension, and roughly forty hours detention.
But most of my teachers still loved me and I wasn't one of the worst.