Followers of classic shows, like Mary Tyler Moore, Rhoda, and Taxi, may recognize a familiar laugh from the audience in many episodes. His "HAW HAW HAW" sounds a little bit like a combination of a honking horn and a goose.

I'm not sure who it is, but my guess is James L. Brooks, since he was associated with all of those shows.

Any other guesses? (Or was the person just an unnamed MTM groupie?)

http://www.sitcomsonline.com/boards/showthread.php?t=240685