Ed Silberman of the San Francisco Bay Area is the only person I've ever seen do this rendition. It's all the more hilarious because he does it with a straight face. I've never asked him where it came from because it takes so long to stop laughing and pick myself up off the floor. Besides, Ed has quite a reputation for silly songs and he writes many of them. I tend to just throw up my arms and say the obvious - "That's Ed!"