re: Quitting a job?

Started out working in academia/research, didn't have a PhD so that ranked me slightly above a janitor. My real boss was a great guy, but I worked with a researcher, Dr.X who decided I would serve as his personal assistant/gofer. Every week or so he would play the boss and berated me and point out what he thought were deficiencies in my work always adding that it was probably more than could be expected from someone that hadn't earned a PhD. I even found out he regularly went through my office to see if I was working on anything he didn't know about. After eight months I had had enough abuse and found another position, after everything was finalize at the new job I gave notice to my actual boss. I explained I was leaving for a position with better long term opportunity and never said a word about my issue with Dr. X. I returned to my office and found a message that Dr. X had called and wanted to see me, went to his office where he started another session of abuse. I let him go thorough his whole routine then dropped on him that the things he was concerned about will not be a problem in the future because I had just given notice and would be gone shortly. His jaw almost hit the desk and he was speechless. It was a very satisfying experience, and fortunately in the 25 years after that everyone I have worked with has been great.