go postal vs unwind

go postal

verb
  • To become aggressive and erratic, especially due to stress; specifically, to carry out a shooting spree at a workplace environment; also (more generally) to become very angry; to lose one's temper. 

unwind

verb
  • To undo something. 

  • To relax; to chill out; to rest and become relieved of stress 

  • To close out a position, especially a complicated position. 

  • To be or become unwound; to be capable of being unwound or untwisted. 

  • To analyse (a call stack) so as to generate a stack trace etc. 

  • To separate (something that is wound up) 

noun
  • Any mechanism or operation that unwinds something. 

How often have the words go postal and unwind occurred in a corpus of books? (source: Google Ngram Viewer )