Herbert H. Franks of Franks Gerkin Ponitz & Greeley P.C. once cross-examined an orange traffic cone during the trial of a slip-and-fall lawsuit and then grabbed the recalcitrant “witness” and threw it across the courtroom.That was one of the stories that Franks’ son and law partner, Jack D. Franks, told at his father’s funeral.Jack also said his father put up a billboard depicting himself as Moses holding the Ten Commandments and proclaiming that the Marengo-based Franks Gerkin was “The …