ha-ha vs piss one's pants

ha-ha

verb
  • To laugh. 

noun
  • A laugh. 

  • Something funny; a joke. 

  • A ditch with one vertical side, acting as a sunken fence, designed to block the entry of animals into lawns and parks without breaking sightlines. 

intj
  • An approximation of the sound of laughter. 

piss one's pants

verb
  • To laugh uncontrollably. 

  • To be extremely frightened. 

  • To wet oneself; to urinate in one's own clothes while they are being worn. 

How often have the words ha-ha and piss one's pants occurred in a corpus of books? (source: Google Ngram Viewer )