contortion vs coup de théâtre

contortion

noun
  • The act of contorting, twisting or deforming something, especially oneself. 

  • A form of acrobatic display which involves the dramatic bending and flexing of the human body. 

coup de théâtre

noun
  • A theatrical trick or gesture, something staged for dramatic effect. 

  • A sudden or unexpected event in a play, pulled off by the author, the director, or even an actor. 

How often have the words contortion and coup de théâtre occurred in a corpus of books? (source: Google Ngram Viewer )