That's the worst you ever heard?
Two nuns were walking down a road in rural Alabama. It was summer-time in the south and terribly hot. The nuns passed an old shack that had a black woman sitting on the porch eating watermelon. She sat there eating her melon with here legs spread wide open. One nun said to the other, "Look at that woman, she is not wearing any panties." The other nun replied, "Maybe it is cooler if you don't wear panties. I am going to ask." The nun called out to the melon eater, "Is it cooler not to wear panties in this hot weather?" The porch-dweller answered, "Well, Ah do' know 'bout dat, but it sho keeps the flies offen my watermelon."