The Postman Always Rings Twice
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A 1934 crime novel by James M. Cain, also adapted into films. The phrase 'let the postman ring twice' is a reference to this title.
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Mentioned once in Moon Dance.
Moon Dance
Season 3 · Episode 13 · S03E13
“grab your husband, take him to the sturdiest kitchen table you have, and let the postman ring twice!”