What about Wooley Bulley (Sam The Sham) and the really really dumb, "Yummie Yummie Yummie".
Oh,and Ray Stevens was good with funny songs as was the guy who sang Spiders & Snakes (Lou Reed I believe)
TIS
grandma got ran over by a reindeer, the streak, its me again margret, mississippi squrrel, i saw elvis in a ufo, and marion michael morrison is always favorites of mine.