English - supply teacher, the class is kind of hyper. A friend gets dared to do something in class, which he does.
Two weeks later, in English again, in the same room, Josh dared me to write up the whole story on the wall. The teacher caught me writing it. I had to explain why I did it - I told her what had happened, and said I was too traumatised by the experience, so I had to write about it. It didn't work, I got a Saturday detention.