"Seinfeld" fans know George Costanza, played by Jason Alexander, is based on creator Larry David. That's what added to the hilarious meta nature of the "Seinfeld" reunion episode of "Curb Your Enthusiasm" when David stepped in to play George. (And then fictionalized Alexander had to teach David how to play George, to make matters even more meta.)
In New York magazine's recent profile of David, timed to his upcoming debut Broadway play "Fish in the Dark," an old anecdote is relayed once again, which should prove that David is indeed George.
Remember "The Revenge" episode, when George quit his job only to sneak back into work the next week and pretend he never quit at all? That happened to David during his gig as a writer on "Saturday Night Live." (He's told the story before.) He apparently quit and yelled at producer Dick Ebersol after his sketches were being cut (only one ever made it to air). But just like George, David returned to work the next Monday like nothing had happened. Things didn't go so well for poor George, though.
For the full profile, head over to Vulture.