I fired a client one time because they screamed at me over the phone for "screwing up" a revision they'd asked for and totally miscommunicated.
I was at a major design conference the next year and noticed their name on a panel - they were discussing "how to build strong relationships with employees and contractors."
I actually attended for five minutes to confirm they weren't saying "here are my mistakes, learn from them." Nope! They just acted like a cool-boss guru type.