There is a book which may still exist, with more bad lines than this entire thread. It was, at one time, sung from once a week by IBM emplyees (so a retired IBM employee assured me, thirty years ago). I heard songs from it being sung at a Computer Conference - some one had got hold of the book, commissioned the Choir of British Secretaries in New York to sing it, and was giving away the resulting LP free . The line of people waiting to get their copy was so long I did not wait - for which I am very sorry to this day.I can only remember one fragment of a line, from a song entitled "March on with IBM" - the fragment was "With our leader Mr. Watson to the fore." Enough said.
My favorite bad line in folk music has caused me to sing the song a few times. It is from a version of Lazarus and Dives which I got off a Young Tradition record. The song ends "There is a place reserved for you, to sit upon a serpent's knee". Perhaps the originator could have answered the famous childhood question "Where does your lap go when you stand up".