hassle vs have bats in one's belfry

hassle

verb
  • To trouble, to bother, to annoy. 

  • To engage in a mock dogfight. 

  • To pick a fight or start an argument with. 

adj
  • hassling; hasslesome 

noun
  • Trouble, bother, unwanted annoyances or problems. 

  • A fight or argument. 

  • An action which is not worth the difficulty involved. 

have bats in one's belfry

verb
  • To be crazy or eccentric. 

How often have the words hassle and have bats in one's belfry occurred in a corpus of books? (source: Google Ngram Viewer )