The year was 1981, and we were driving into Manistee, Michigan to play a club called The Silver Fox. As we rounded a curve, up ahead was a girl on a bike. She was half-standing, peddling hard, and had a well-rounded posterior.
At exactly the same time, on exactly the correct pitch, the drummer and I sang out:
♫♫ Fat Bottomed Girls, You Make the Rockin' World Go 'Round!! ♫♫
Then of course we all busted out laughing.