Early production on The Late Show With Stephen Colbert came to a screeching halt Wednesday as United Airlines flights were grounded, the New York Stock Exchange went dark and dogs began walking on two legs ? mass hysteria! Amidst the computer-bred chaos, though, Colbert sought safety in his office and recorded a dire, desperate message pondering humanity's new fate. Colbert said, "I have to wonder if there's anyone left alive to see this broadcast.