you could put a cow under your hood.. Yeah.. with a rope around its neck, and instead of pushin on the wheel.. Just pull the rope..
But, if realizm isnt a top priority, you could always get one of those mulitple sound horns..
But in my opinion.. Please dont?
Check this one out..
http://www.jcwhitney.com/webapp/wcs/...0101&langId=-1
You can play just about any farm yard animal with that baby.. along with machine guns, police sirens, and the ever so popular La Cuca Racha (sp?)