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There are two episode titles from two separate shows that are written similarly:

  • From Castle: The mistress always spanks twice
  • From Doc Martin: The GP always rings twice

Episode titles are usually clever plays on words, so I'm assuming the two titles are alluding to a common expression. What expression (or other cultural reference) are the titles making a reference to?

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up vote 10 down vote accepted

Probably from the novel ‘The Postman Always Rings Twice’ by James M Cain, published in 1934: http://en.wikipedia.org/wiki/The_Postman_Always_Rings_Twice_%28novel%29

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