can see a somewhat impromptu google tech talk given by Randall Munroe
here. Donald Knuth was invited to the event and asked a couple questions... My god, how do you deal with something like that? He also explained his views about python in front of the guy who invented the language (who works at google). Geez. I'd freeze up. I'd feel that anything I could possibly say would sound so horribly uninformed that I'd just make a fool of myself.
Anyway, it's entertaining if you have a free hour.