Ive done a couple. We broke into the school one night and did one in the mobile classrooms. It spelt out 'mole' which was my mates nickname.The heater in the classroom also started spitting and smelling at the same time (but thats probably cos we all used to gob our greenies on it) We freaked out and went home, he was convinced he was going to die in his sleep. Next night was firework night and his dad let some rockets off in his garden and all of us were round there. One flew up and flew down between his legs missing his nuts by a whisker.lol

We still talk about to this day.