At my last job I was after hours talking with the boss and one of the other workers came up and tried to inject himself into the conversation by insulting me. I looked at the rude fucker and said, "Stop talking like your opinion matters" and without skipping a beat I went right back into what I was saying to my boss. Alas, the conversation was well over at that point because my boss couldn't stop laughing at the shocked expression on rude guy's face.