Spike etc. on a radio: " WHOOPEE!" *Musical instruments, cowbell, and a pistol shot*
Earlier in the episode, Peggy had told Luanne they had "better get on the road before that Dr. Demento starts stinking up the air waves." Just before one of the commercial breaks, the scene cuts from Hank to Peggy and Luanne driving, the storm about to break. The song coming from the radio is Cocktails For Two, by Spike Jones. This is, indeed, a popular staple from The Dr. Demento Show, appearing on the 20th Anniversary Collection CD's.