Okay, since you mentioned Dragon*Con, here's a story for you from last year:
I was in the elevator with my friend Stephen (bottom left in that picture above), and about two dozen other people. One lady got off at her floor, turned around, noticed Stephen, and said "Omigod, you're the Dragon*Con TV Guy! You're famous!"
(He has done about a million spots for DCTV, and he gets this all the time at 'Con.)
Stephen: Oh, I'm not famous.
Half the people in the elevator: O M G! You totally are! You're famous!
Then after we got off the elevator, he cracked up - because Scott Adsit (of "30 Rock" fame) was standing directly behind him the whole time. And nobody else recognized him.