There's also Cole Porter's infamous war-time ditty:

"I'm A Cranky Old Yank in a Clanky Old Tank on the Streets of Yokohama with my Honolulu Mamma Doing the Beat-o, Beat-o, Flat-on-my-Seat-o Hirohito Blues", recorded by Der Bingle in the early 40s.

It ain't folk (though perhaps almost as queer as), but it does qualify for bizarre...