The Pawn Stars sing "Hail to the Chief" when an autographed collection of presidential memoirs comes into the shop. Written and signed by President Harry S. Truman, will Rick campaign to buy these rare books, or is the seller just not on the same page? Then, Corey and Chumlee are presented with a toy "Robby the Robot" from the 1956 movie, Forbidden Planet. Can this mechanical gizmo automate the deal or will it run out of batteries? And later, a guy brings in a can of Zoo Doo brand elephant manure. Made by a zoo as a novelty item, will Chumlee and the Old Man put all their chips on the table for this gag gift, or will it be impossible to ignore the elephant in the room?