Gave my teacher the finger, on both hands, in fifth grade.
The whole class was all like *omg dude wut he jus do?!?!*.
Then after a minute of silence, everyone starts clapping as I give my bitchy teacher another finger, and she stomps out.
Five minutes later the principal walks in, and I explain what made me do it (she had been yelling at my friend because somehow she thought that my friend had been harassing some other kid, and it got to the point where my friend began to cry like hell because she had begun to swear and scream at the highest sound level known to man, plus she was threatening him for some fucked up reason). Then the principal looks at my teacher and goes, "Get the hell out of my school, now."
She just kind of left the building silently.
Five days later, her body was found in the streets. I think the cause of death was something like drug overdose.