I do recall having a Strike Witch-esque confrontation with a teacher.
My Primary school was small, about 30 children to a class and 6 classrooms. But because of the lack of spaces in other schools our school was quickly reaching it's maximum amount of students, so they would put the smartest Year 3 students with the year 4 students, 4 to 5, and 5 to 6. Well when I was in Year 4 (Aged 10), all of the year 3 students below would go swimming in the mornings, leaving us with a substitute teacher.
This substite was horrible. She'd just set us meaningless comprehension task in which we'd put things into alphabetical order, yell at us, and talk about her fucking chickens. I remember one incident where a girl started crying cause her dog had died that morning and she literally dragged her out the class by her hair.
Well, one time after she had left the room I went over to borrow a pencil from a mate, then nonchalantly leant back on a chair, I slipped and ended landing with a pencil in my neck from the pencil pot behind me. The amount of blood dripping down my neck was plain enough to see but when she came in and I told her she just said, "Don't be stupid and get back to your work." This really pissed me off so I let the blood from my neck run into my hand and slapped her across the face with it. She was never seen at my school again.
Still have a scar from that pencil pot. >.>
That's probably the worst thing I've ever done as a kid.