:-D
OK, t'was a detention system, first a warning, then a 10min detention at the next break, then a 1 hour detention after school the next day. The 10min ones don't bother me, but the 1 hour ones...
Anyhow, I kept getting them, and I would always whistle and tap my desk, until they sent me home, scheduling me for another one the next day. Either I wouldn't turn up, or the above would repeat.
I did that every day until the last month of school, when they abandoned it. At one point, my Key Stage manager threatened to expel me for tapping and whistling. Another time, they took away my desk and chair, and then I just got my things and walked out.
So yeah, as I said, they gave it up in the last month. I know that's why they stopped it because I got quite a few letters home on the subject.
I'm good at exploiting system faults.