The elusive Mr. P was a guest on "The Simpsons"
No, really! The January 25, 2004, episode, in which Marge writes a novel and gets celebrity author endorsements, features Mr. Pynchon's real voice when he appears as himself. The character had a bag over his head. :D
You might like this if you haven't seen it: "Thomas Pynchon: Man of Mystery".