Well, this happened to me in-game:
I was sitting in Flourite, around the dead hours when hardly anyone is on FeralHeart with one of my closest friends. We were whispering each other over and over until some black, emo, brute strolled up and decided to start boasting about how 'good-looking his character' is and how all the ladies chase after him. He kept going on and on about it but my friend said something along the lines of, "Yea, he definitely isn't pretty. His coat is too bland, his markings too bold, I see many individuals with his design daily. I don't see what he's boasting about. Little nub."
However, she managed to say that in Local chat where he could hear us. That's when he began caps raging on us and practically on FeralHeart altogether.
My friend and I, we practically held our tongues, swearing in Whisper yet laughing till' we cried due to her mistake and the way he reacted. Then when he wanted an explanation from us, I just said, "Quack" and let the conversation wrap up with that. Probably not as embarrassing in my case but it sure was hilarious.