Hi Mark,
I'm reluctant to confess what I used to get up to in school. I was the top chem student and the Lab assistant was a close personal friend of mine. I learnt a lot very quickly. Youthful exuberance motivated me.
I never dared to pull pranks during chem class
but the english and geography classes were fair game.
Even the maths and physics classes experienced a little bang now and then.
In class the slightest shift of a student desk would trigger the paste on the floor. The huge bang and crimson smoke attracted undue attention. The "victim" was often blamed for the disruption.
Smoke bombs led to class evacuations; touch paste, exploding chalk as it touched the blackboard, Blackboard dusters exploded on contact. I was never caught. I told no one it was me.
The toilets were not safe. Mainly the female ones.
That's just briefly what I got up to. I won't admit I went to school in South Aust.
Cheers Marty