Movie veteran Charlton Heston has fired back at George Clooney after the hunk mocked his Alzheimer's condition on TV in America on Monday night. A ranting Clooney appeared on The Charlie Rose Show to attack both President George W. Bush's war policies and National Rifle Association president Heston's pro-gun stance. But an ill-judged joke about Heston's illness has left the Ben-Hur star firing back - using Clooney's dead aunt Rosemary Clooney. Clooney quipped, "Charlton Heston announced again today that he is suffering from Alzheimer's." And Heston hit back, "It just goes to show that sometimes class does skip a generation."...