door prize vs numbers game

door prize

noun
  • A gift given to people who attend a meeting, party, event, etc., especially one which is given on a random basis to one or some of the attendees. 

  • A notional prize awarded to a cyclist who collides with the open door of a parked car. 

numbers game

noun
  • A lottery in which bettors attempt to guess which numbers will later be drawn randomly. 

  • The use of inappropriate statistics (numbers) to reflect a desired result (usually misleading). 

  • An activity that benefits from having many things to work with or on. 

How often have the words door prize and numbers game occurred in a corpus of books? (source: Google Ngram Viewer )