answer: #Person2# tells #Person1# #Person2# is late because of #Person2#'s stopped watch.
documents: #Person1#: Here you are at last! You're half an hour late, you know. 
  #Person2#: I'm awfully sorry to have kept you waiting for so long. 
  #Person1#: What happened? 
  #Person2#: My watch stopped and I didn't know. I certainly need to buy a better one.