Had to record the only good comeback I've ever had:

The other day I was on my way to work at one of my part-time jobs, a skin care store in Cambridge. (Discretion tells me not to list easily Google-able things about your job on blogs anymore.) I ran into A., this standard Harvard archetype - brisk walker, loud talker - I know.

A: So, what are you up to?
MJR: I'm on my way to work.
A: Oh, working in a skin care store, that's really going to help you out in the world of comedy writing. Very Onion-y.
MJR: Well, it does teach me that you have an oily T-zone.

ZING!