"The first day, Find a kid that has shifty eyes. The one that looks like he's going to be trouble. Then, bring that kid up front, kill'em, and nail'em to the white board. The rest of them will do whatever you tell them to until the body stops smelling. Then you may have to do it again."
I stared at him, horrified, and he started laughing. I still hear that laugh every time I have to deal with discipline.