banana skin vs contretemps

banana skin

noun
  • A cause of difficulty, or potential embarrassment. 

  • The outer skin of a banana, especially once removed from the rest of the banana, which may be slippery if stepped on. 

contretemps

noun
  • An unforeseen, inopportune, or embarrassing event. 

  • An ill-timed pass. 

How often have the words banana skin and contretemps occurred in a corpus of books? (source: Google Ngram Viewer )