knock me over with a feather vs son of a gun

knock me over with a feather

son of a gun

noun

  • son of a bitch 

  • Used encouragingly or to compliment 

intj

  • Used to express anger, contempt, disgust, astonishment, disappointment, etc. 

How often have the words knock me over with a feather and son of a gun occurred in a corpus of books? (source: Google Ngram Viewer )