I stabbed a guy with a compass and he got a detention for it.
My only real detention in school was for not going to 'science detention'.
Basically, I just changed to a new school and starting in new classes and forgot about a homework for chemistry. That meant I should have gone to 'science detention' after school, but my chemistry teacher (an insufferable prick and the only teacher I never liked even a bit) just assumed I knew that and neglected to tell me.
He asked for my homework, I said I didn't have it, and he just said 'ok'.
As I never went to the first detention, I was supposed to go the next week. But I didn't. So it rolled over again and again, until eventually it meant I was down for a lunch detention.
And for some reason lunch ones, and who had them, were published in the daily tutor report, so I found out in morning tutorial and had to go.
Anyway, I went, my year head/english teacher saw me, asked me why I was there, I explained how it was a misunderstanding about a forgotten homework from two months ago, and she let me go early.