Tom Arnold stopped by to promote his CMT series, 'My Big Redneck Vacation,' and crow about his pregnant wife, Ashley, crediting the miracle of test-tube conception. The couple failed to conceive naturally ("It was so devastating.") for so long that Dax Shepard offered to donate his sperm: "I don't know if I'm breaking a confidence. But that is about the kindest thing. Seriously. … He is the nicest human in the world."