When I worked for a large multinational energy services firm, one of the bosses I had (they changed every 2-3 years) was a huge bully. One of those "great coworker, bad manager" types. My wife had passed away, and as a result, my performance had dropped.

One of his lines (verbal in person, not on paper) was "If you don't want to work here, there are plenty of people that do."

He was the only boss I've ever had that made me consider leaving a job I'd had for 7+ years (at the time) simply because of who my manager was. Needless to say, about a year later when he called a meeting to announce that he was leaving for a competitor, my back popped as my shoulders un-tensed.