We set fire to a desk with bunsen burners, posined the fish. Found a great way of getting outta science early by smashing the thermometers people go mad over mercury...go figure.
We also locked a French teacher in a cupboard, turned all the desks upside down and left.
I pushed my friend through the window in the history room and he smashed it and we both ran away.
To name but a few.
Oh and my fav we had mini mic and recorded the science teacher goin off on one and past it around the class replaying it back for the whole class. Haha he was well angry think I went to the headmaster for that cant remember though.