Frank Zappa once said:
The family was from Arkansas. The Dad (Dink) was a furniture salesman in San Bernardino, but, back in the way-bak-when, he used to play 'bones' or 'spoons' in a minstrel show. To relive the golden days of yesteryear he would, from time to time, force his children to accompany him (Ronnie on guitar, Kenny on trombone) in a living room replay of a minstrel routine called "Lazy Bones.
The kids often found this to be an inconvenience, as they were fascinated by, and constantly perfecting new techniques for, The Manly Art Of Fart-Burning. Kenny explained to me that it was scientific - that it demonstrated (this is a real quote) "Compression, ignition, combustion and exhaust." -- Kenny & Ronnie Williams (later "immortalized" in "Let's Make The Water Turn Black")
From "The Real Frank Zappa Book" Chapter 4