Went over to bitterwaitress.com's website (link is on the right) and found this great entry and decided to share:
This may be an apocryphal story, but I read a version of a response to that loaded question "Do you know who I am?" which is really, as we all know, a demand for special treatment, whether we know who they are or not. And who cares who they are? Anyway, the story is about an airline ticket agent, who, after a customer threw that question at her, supposedly picked up a microphone and announced she had a customer at the counter who didn't know who he was, and could anyone help him figure it out?
You have got to read that site. Fabulous!