Not quite quitting a job but my course in college. Had 5/6 lecturers in my first semester last year that were totally unprepared and some were even clueless on simple things. One line was if I had five more minutes it would have worked when showing us how to code in python(he was using Java conventions) this was 10 minutes after the lecture should have finished. After 3 months of that utter crap and a summer of studying for repeat exams(had mumps for the original exams) I was ready to quit. Good thing the year I was in was good fun to hang out with other wise I would be working in McDonald's right now