This is such a ridiculous song, but it gives me a strange and twisted delight. Came across it one morning years ago on the Minnesota Public Radio Morning Show (miss those guys bigtime!) and it stuck in my head, so I was glad to find your post for the occasional hit. :P
20200621: Wouldn't be surprised if it was the insurance chap, knocking on the door, singing in the bathtub. Must be the wrong time day for the milk man. Everybody's happy, when singing in the tub.