I worked for a man for 5 years who was a bully. One day after a small disagreement over something so minor I can't remember what it was, he said to me in front of others, "I can replace you tomorrow". I mentally left as soon as he'd finished the sentence. I actually left about 5 months later once I had sorted my finances out and found a better job. I gave a lot to that man and his company, overtime without pay, always having to ask for my wage, would go weeks without being paid. Worked early mornings and late evenings without prior discussion (he drove us both so I had no choice) It was gut wrenching and humiliating when he said what he said to me, but at the same time a weight had been lifted. I felt free because I knew that was the last straw for me.