Where did the phrase "you don't know jack sh*t" come from?

Jack Schitt is the only son of Awe Schitt. Awe Schitt, the fertilizer magnate, married Miss O. Needeep They had one son, Jack. In turn, Jack Schitt married Noe Schitt. The deeply religious couple produced six children: Holie Schitt, Giva Schitt, Fulla Schitt, Bull Schitt, and the twins Deap Schitt and Dip Schitt. Against her parents' objections, Deap Schitt married her cousin Dumb Schitt, a high school dropout. After being married 15 years, Jack and Noe Schitt divorced. Noe Schitt later married Ted Sherlock, and, because her kids were living with them, she wanted to keep her previous name. She was then known as Noe Schitt Sherlock. Meanwhile, Dip Schitt married Loda Schitt, and they produced a son with a rather nervous disposition named Chick N. Schitt. Two of the other six children, Fulla Schitt and Giva Schitt, were inseparable throughout childhood and subsequently married the Happens brothers in a dual ceremony. The wedding announcement in the newspaper announced the Schitt-Happens nuptials. The Schitt-Happens children were Dawg, Byrd, and Hoarse. Bull Schitt, the prodigal son, left home to tour the world. He recently returned from Italy with his new Italian bride, Pisa Schitt. Now when someone says, "You don't know Jack Schitt," you can correct them.

Hi Rowan-good to see you back haven't heard from you for a while-unfotunatley can't help you on this one it will be interesting to see if anyone else knows though-your friend littleowl