Quote from Adrian Monk in Mr. Monk and the Bully
Captain Stottlemeyer: What? What are you doing? You're doing divorce work now? Natalie: No, he was just doing a favor. He was an old friend of Mr. Monk's. Adrian Monk: Wouldn't exactly say he was a friend. More of an acquaintance actually. He beat me up every week for three years. Captain Stottlemeyer: And that would explain the stupid grin on your face. You think you're getting even. Adrian Monk: I know I'm getting even.