bits and bobs vs litter box

bits and bobs

noun
  • A random assortment of things; small remaining pieces and items. 

litter box

noun
  • A box used to provide a soiling area for (usually) pet cats, generally filled with kitty litter, sand, clay chips, etc. 

How often have the words bits and bobs and litter box occurred in a corpus of books? (source: Google Ngram Viewer )