piss in someone's cornflakes vs rain on someone's parade

piss in someone's cornflakes

verb

  • To disappoint or irritate someone. 

rain on someone's parade

verb

  • To disappoint or discourage someone by ruining or criticising their plans or aspirations. 

How often have the words piss in someone's cornflakes and rain on someone's parade occurred in a corpus of books? (source: Google Ngram Viewer )