Tom "I'll sue the tits off anything that uses my songs to shill crap" Waits did a television commercial?! Why, yes he did, a 1981 ditty for Purina's Butcher's Blend dog food entitled, ironically if you squint, "Billboard". Turns out the late 70s/early 80s Hell of his relationship with both Rickie Lee Jones and his manager Herb Cohen going south combined with a little ennui over his not huge success both financially and commercially may have spun the poor man's head a little, resulting in the (real weird if you're into his music) bone-chilling sound of Tom's Voice growling with desire "beef... liver.... bacon"

Read a good summary of the period in Tom's life which lead up to this here, including this interesting tid-bit:

"Robert Hilburn (1999): "Waits moved to New York around 1980, partly to shed some of the hard-drinking L.A. habits, even enrolling in a fitness class. Smiling as he recalls an image from that period, he says, "I was running down the street to the Y to work out and I had a glass of alcohol in one hand, with some aluminum foil over it so it wouldn't spill, and a cigarette in the other hand. . . and I realized I was kind of coming apart."