“Goodnight Mrs. Calabash, wherever you are.”
Famous sign-off line to all his radio and TV shows, the meaning of which he never publicly revealed, leading to much speculation and many theories. Only after his death did it become public knowledge that it was reference to his first wife, Jeanne Olson, who died in 1943, and that Calabash was a private name between them for Calabasas, California, where she spent much of the final years of her life.
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Jimmy Durante 11
American jazz singer, pianist, comedian and actor 1893–1980Related quotes
“HOBBES:
If you don't get a goodnight kiss you get Kafka dreams.”
The Authoritative Calvin and Hobbes
It's commonly believed that at the end of stage shows Allen would reply to George Burns line "Say goodnight, Gracie", with "Goodnight, Gracie". Recordings from the time do not have her using this reply.
Disputed

Closing remark to the Presidential debate with Mariano Rajoy in the 2008 election campaign.
As President, 2008

“Goodnight sweet prince, may flights of devils wing you to your rest.”

Lullabye (Goodnight, My Angel).
Song lyrics, River of Dreams (1993)