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say "knock, knock." >> i say it? >> yeah, go ahead. >> knock, knock. >> who's there? >> there was only three networks. there was only one late night show, really, and it was jack paar. >> they don't understand how we do this show. we just keep talking with no script. >> i know. it's agony. >> jack paar invented the late night television talk show. >> you feel confident? >> there is not a man in the world to beat me. i'm as pretty as liberace. >> jack had in his corner his personality. his fabulously, interesting, complex, frightening, neurotic, but in other cases enthusiastic and informed personality. it made for great television. >> how much time have i done? i don't have a watch either. how much? has it been charming? i'll quit now, then. >> here's johnny!