英语笑话:Is this a Promise or Threat 是许诺还是威胁

"My friend, I say I had some trouble." A man said to his friend, "Yesterday I had words with（争吵） my wife. After that she punched the door and rushed out angrily with the word that she would live with her mother. Please help me. Is this a promise or a threat?""Do you think there are differences between the two?" his friend asked."Yes, quite a lot. If it is a promise, that means that my wife is sure to be with her mother, and if a threat, that my mother-in-law will move and live with us."