Flashback to 2006: Colbert Roasts Bush

Just rewatched one of my favorite clips on Youtube and wanted to share it.  Colbert was invited to speak at the 2006 white house correspondents dinner.  I have to believe that they didn't realize he was a poe, for what followed was an unforgettable roast of president Bush to his face. Surely they should have known what was coming, but the progressively more apprehensive expression of George W. Bush throughout the speech suggests otherwise.