banana skin vs ordeal

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. 

ordeal

noun
  • A painful or trying experience. 

  • The poisonous ordeal bean or Calabar bean 

  • A trial in which the accused was subjected to a dangerous test (such as ducking in water), divine authority deciding the guilt of the accused. 

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