buggy vs round the bend

buggy

noun
  • A hearse. 

  • A small horse-drawn cart. 

  • A small motor vehicle, such as a dune buggy. 

  • A pushchair; a stroller. 

  • A shopping cart or trolley. 

adj
  • Crazy; bughouse. 

  • Containing programming errors. 

  • Resembling an insect. 

  • Infested with insects. 

round the bend

prep
  • Crazy, mad or insane. 

  • Close to or in close proximity to another location. 

How often have the words buggy and round the bend occurred in a corpus of books? (source: Google Ngram Viewer )