One was when my brother Joe and I pulled putty off the newly installed windows at our elementary school, which resulted into at least two trips to the principal's office (more than one to heighten the fear factor, I'll bet). And like the baby that I was (am?), I ratted on him--I wasn't going to take all the blame.
But probably the stupidest thing I did at that age was when I was goofing around in class and put an eraser in my ear. Suddenly, I couldn't get it out--it somehow went into the ear canal (must have a pretty dull subject we were covering that day). I think the folks at the nurse's station finally flushed that thing out of my ear.
All right. Your turn now. Tell me your moments of anarchy--I was trying to make that sound important, but "error" is a better word for it--at school.