And for a truly screwy song, "Christmas is Revolting (and So Are the Elves)", by the Tuna Observatory (which was Chicago radio personality Kevin Matthews and anyone else he may have roped into doing it) from 1983. This is also probably one of the rarest songs out there - it's been played on Dr. Demento, but except for a vinyl 45, it's never been released (and I'm not sure that 45 was ever properly released).

I have one.