This special looks back at highlights of Maher's irreverent run on TV, featuring archival footage from both "Real Time with Bill Maher" and "Politically Incorrect," as well as appearances by such notables as Salman Rushdie, Maureen Dowd, Billy Crystal, Larry David, Martin Short, Woody Harrelson and Barbra Streisand, among others, who offer observations on what has contributed to his success over the years and what continues to set him apart.