Gene, Gene, made a machine
Joe, Joe, made it go
Art, Art, let a fart
And blew the whole damn thing apart.

Yankee Doodle went to town
Riding on a turtle
Turned the corner just in time
To see a lady's girdle.

While shepherds washed their socks by night
All seated round the tub
A bar of Ivory soap fell down
And they began to scrub.

He had an apartment in front
And she had a flat behind.

And from Allan Sherman:

On top of old Smokey
All covered with hair
Of course I'm referring
To Smokey the bear.