We waited until the toilets were empty and Cyril was nice and comfortable reading the form and puffing away on one of his “roll your owns”. We quietly snuck in and I lit the sky rocket at the same time Phil lit the bunger. Phil rolled it under the cubicals and I waited until the fuse on the rocket was well under way before letting it go.
The next minute there is an almighty bang, sparks of different colours and a cloud of smoke followed by an absconding Cyril. In a matter of seconds the Headmaster was on the scene with several teachers asking what happened.