kiss of death vs que sera sera

kiss of death

noun
  • A kiss on the cheek that signifies the death of the receiver, as delivered by a mob boss or one with such influence. 

  • Something that may seem good and favourable but that actually brings ruin to hopes, plans, etc. 

que sera sera

phrase
  • "whatever happens, happens" (more literally "whatever will be, will be") Ostensibly employed to express a personal philosophy of fatalism and acceptance of the future. 

How often have the words kiss of death and que sera sera occurred in a corpus of books? (source: Google Ngram Viewer )