My mom used to sing it along with Mairsie Doats.

Boom boom, ain't it great to be crazy?

Boom boom, ain't it great to be crazy?

Itty atty foolin' all day long

Boom boom, ain't it great to be crazy?

A man bought a combination to his underwear.
He wore it nine months and it hadn't got a tear.
He wore it nine months and without exaggeration!
He found he lost the combination to his underwear!

Boom boom etc

A horse, a flea, and three blind mice.
Sat on a corner shooting dice.
The horse - slipped - fell on the flea...and the flea said Whoops, there's a horse on me!

Boom boom etc

Oh, and she used to sing Doin' what comes Natcherly. She was WWII generation, so I suggest looking back to the 1940s or 50s.