bombshell vs turn-up for the books

bombshell

noun
  • A bomb or artillery shell designed to explode on impact. 

  • Something that is very surprising, shocking, amazing or sensational. 

  • Someone who is very attractive; a sex symbol. 

turn-up for the books

How often have the words bombshell and turn-up for the books occurred in a corpus of books? (source: Google Ngram Viewer )