"Say Good Night, Gracie"
The legend was born of their vaudeville routine and carried over to both radio and television. As the show wrap-up Burns would look at Allen and say "Say good night, Gracie" to which she would usually simply reply "Good night." Popular legend has it that Allen would say, "Good night, Gracie." According to George Burns, recordings of their radio and television shows, and several histories of old-time radio (John Dunning's On the Air: The Encyclopedia of Old-Time Radio, for example), Gracie never used the phrase. The confusion may have been caused by Rowan & Martin's Laugh-In. Stars Dan Rowan and Dick Martin used a similar sign-off routine wherein Rowan would tell Martin to "Say good night, Dick." Martin's reply was always "Good night, Dick." It seemed like something Gracie Allen would have said.
George Burns himself said as much in an interview years later, adding that, surprisingly enough, no one ever thought of having Allen say "Good night, Gracie". However, the former Burns and Allen head writer, Paul Henning, did use the "say good night" bit in at least one episode of the Beverly Hillbillies (The Richest Woman, aired January 5, 1966, two years before Laugh-In premiered. JED: "Say good night, Jethro." JETHRO: "Good night, Jethro.")
Read more about this topic: Gracie Allen