pull the rug (out) from under vs scare

pull the rug (out) from under

scare

noun
  • A cause of slight terror; something that inspires fear or dread. 

  • A minor fright. 

  • A device or object used to frighten. 

verb
  • To frighten, terrify, startle, especially in a minor way. 

adj
  • lean; scanty 

How often have the words pull the rug (out) from under and scare occurred in a corpus of books? (source: Google Ngram Viewer )