In my last year I "borrowed" many blackboard wipers (
http://members.lycos.nl/Mheenbull/hpbimg/Borstel_Vilt.jpg) to confuse and befuddle the teachers as to where their shit had gone. After a few months I had 52 of them.
We smoked massive, massive amounts of weed in between classes.
The Rome trip was abso-fucking-lutely fantastic. So much shit went on there.
In 2nd class we had crazy throw-things-at-eachother fights during Greek class. It started out mellow but at the end there were scissors and sharp stuff flying around like crazy, to this day I'm still utterly baffled that no one lost an eye during those periods.
All the different teachers were hilarious in their own way, and the way we'd make fun of them. Our economics teacher was crazy, worse than most students in a way.
I remember on a skiing trip, a whole bunch of us lads bought simple cheap small plastic one-seater sleds, and used them to scoot down a quite steep slope. A lot of laughs, a few injuries and one bloke that looked rather uncomfortable after coming down, and with a sheepish grin on his face announced that he'd shit his pants. God, we were rolling in the snow laughing for literally five minutes after that.
Or sometimes my buddy and me would gulp down two tall cans of cheap beer right before PE-class. Gym is more fun when tipsy, that's for sure.
Way back in the day we had a crazy, unreasonable and annoying french teacher. Nasty woman, crazy temper, but not scary. One of my mates once ate a baguette and had a tall can of beer right in her fucking classroom, in plain sight. I can't believe she "allowed" that. Maybe she simply didn't see, I can't remember. Long long time ago, lol. Even funnier considering we were like 16 at the time.
Aaah, good times, good times.