Car horns that honk ringtones

We got tired of the old brick-phones' cliché rings, so someone got the idea to make them ringtonable by having the user download music onto it and choose them to play when someone calls.

In traffic, we're still stuck with the same, tired horns.

I think rush-hour and traffic jams would be far more entertaining to other motorists if I could play "The Legend of Zelda: Overworld Theme" through my horn.

If we can add more variety to our phones, why not add them to our cars???

I guess if nobody else has bothered to make car horns ringtonable, then maybe I should build a prototype of a ringtonable car horn.

But if somebody has, where can I buy them?

UPDATE: Cracked.com goes over them on #6 in this article.