Jobs!
I have a particular grade 6 class that are so unruly I may refuse to teach them at all. I'll stick at it until the summer but in September or October if they haven't improved (I suspect they'll only get worse) I'll possibly tell my VP I'm not going to deal with them any more, and if they want to fire me so be it. I don't know how the school will react but if I'm happy to leave anyway it's either that or I get an easier second semester.