How about "Muskrat Love"? Or possibly one of the worse of any age - Marzy Doats (Mares eat oats)? Those two certainly rank up there on my list - along with Don't Worry Be Happy, which was already listed.
Anne (?) you're right about Harry Connick Jr. Just heard him on the fund raising show singing When the Saints Go Marching in - certainly no credit to the city he says he loves!!