fun police vs spoilsport

fun police

noun

  • A metaphorical police force imagined to prevent others from having fun. 

spoilsport

noun

  • Someone who puts an end to others' fun, especially harmless fun. 

adj

  • Like a spoilsport. 

How often have the words fun police and spoilsport occurred in a corpus of books? (source: Google Ngram Viewer )