Since I'm in Cambodia I met a lot of people, and one of the first things you end up talking about is what you do for a living. As you all know, I work for a tobacco company. I had lots of constructive chats about it; pros/cons of the industry, tobacco law, etc. But this one time this person was not interested in debating any ideas, just being unpleasant and saying a few smartass clichés with her blasé attitude. And as most of you know, I don't really waste time with stupidity. 

Her: Oh, you work for '....…' ?

Me: Yes.

Me: I don’t drink coffee after 7.

And that was pretty much it.