I put together a NC letter last week, but didn't send it straight away. I wanted my wife to "proof-read" it and see me send it. Part of the letter included a threat that if my AP and I were to get together again, my wife would tell her family. That her parents and grandparents would probably not be proud of a woman who tried to break up a marriage.
The response: "Same goes for you, asshole."
What? You're going to tell my Mom that we had an affair? Sorry, she already knows. I'm assuming my AP only read the first paragraph, which was the part explaining that I was never going to see her again, and fired off that message before reading the rest of it.
Anyway, got a kick out of it and thought I'd share.