Am I to understand that Bill Cosby never, in fact, actually stated, "People think I'm Bill Cosby... but I'm really tooth decay," in reference to his Pepsi endorsements? Is sounds like a sample when listening to Negativland's album Dispepsi, but. Maybe it's a little audio mosaic they fabricated. Regretfully, a query on Google for "remorseful bill cosby" returns no results, which is a pity because I like the rhythm and color of the phrase.
Here is a
link to the song if you'd like to evaluate for yourself. It's a bit arduous out of context, and not exactly the band's magnum opus, but. If found-sound "plunderphonia" is fun for you, check out the album.