Robert Nighthawk doing one of his best songs ever:
And here is a great bio which includes this gem:
Word spread quickly through the small Delta town and by nightfall the little cafe was packed. Accompanied by James Starkey's piano, Nighthawk and Stackhouse battled throughout the night neither leaving the stage for a minute. After hours of playing, they became too tired to stand, and sat on the floor. By dawn, both musicians, unwilling to let up, were sitting in pools of their own urine, still battling it out.