(By Charles Chandler, cchandler@charlotteobserver.com) Panthers quarterback Josh McCown can't – and doesn't try to – hide his sense of humor. Thursday, he was asked about Saturday night's exhibition at Miami, a team that kept him all of six months as a prospective starter before trading him to Carolina. “This is a huge revenge game for me,” McCown said, deadpan. “It's big-time. I've had this marked on my calendar since the preseason schedule...