Re: Mozart's "Musical Joke" - Explanation

In the explanation that I found on this Mozart piece, it's stated that he was imitating the way starlings sing, including the flat notes and the changing tempos. (He had a pet starling that died, and this piece was written shortly after he threw an elaborate funeral for the bird.)
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I've heard a different and more plausible possible explanation, which is that he was making fun of other composers' musical styles. This may have been in the movie "Amadeus," but I don't know where it came from. Maybe Richard Hoover.
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Either explanation works, considering who composed this crazy, funny piece.
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Speaking of funerals for pets, Lord Byron forced all his servants and guests (read hangers-on) to attend the funeral of Boatswain, his Newfoundland dog. The inscription on the headstone is a long boring poem, ending with these lines:
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Ye! who perchance behold this simple urn,
Pass on--it honors none you wish to mourn:
To mark a friend's remains these stones arise;
I never knew but one,--and here he lies.