The Straw That Broke the Camel's Back
This happened a few months ago. I was assisting this teacher who was pretty inept at his job for a number of reasons. He was horribly unprofessional, refused to deal with problems in the classroom ("If I ask that person to stop behaving disrespectfully they'll report me and I'll get fired"), made no time for students outside of classtime and responded very angrily anytime any constructive criticim was presents ("Thanks for making me cry in the middle of the staffroom at lunchtime, *******). I knew that most of the students were unhappy too. Anyway, I arranged a private meeting with one of my superiors and asshat was gone the next day. Woo! Apparently his previous employer (different branch of the same company) had had pretty much the exact same problems with him, so there was no doubt that I was not being honest.