I would say take to offensive. Its not the revenge I am talking about. Its the fact that its extremely important to not let those teachers ruin any more money a

I would say take to offensive. Its not the revenge I am talking about. Its the fact that its extremely important to not let those teachers ruin any more money and life/career (in some cases). One possible path: Go talk to your college's administration (take evidences along like slides, etc.) and suggest your college to encourage this behavior among students. An incompetent teacher has absolutely no rights to teach.