This ice cream joke comes courtesy of the hardwork and research done by one of my favorite indie rock bands, WE ARE SCIENTISTS. So here it is straight from the Sci-Cave folks!
And the difference between a cow and ice cream?
Ice cream's contents are enclosed by waffle, and a cow waffles when you ask him to disclose his contents!
See www.wearescientists.com for more awesome yokes n' yuks.