Stolen from fellow blogger, Troutbirder.... see here for full amusing post
A couple drove down a country road for several miles, not saying a word. An earlier discussion had led to an argument and neither of them wanted to concede their position. As they passed a barnyard of mules, jack asses, and pigs, the husband asked sarcastically, "Relatives of yours?"
"Yep," the wife replied, "in-laws."