Around here, we've been watching the high's and low's of former Miami Dolphin Chad Johnson's career for a while. But that career, as you probably know, has come to a screeching, irrevocable low owing to his arrest for resorting to physical violence during a dispute with his wife. HBO's Hard Knocks got footage of his firing at the hands of Head Coach Joe Philbin, and it is a brutal, can't-look-away picture of a man who sees his empire crumbling because of his one big mistake ...