"My friend, I have some trouble," a man said to his friend. "Yesterday I had words with my wife. After that, she punched the door, rushed out angrily, and said she would go live with her mother. Please, help me. Is this a promise or a threat?"
"Do you think there's a difference between the two?" his friend asked.
"Yes, quite a lot," the man replied. "If it's a promise, that means my wife is sure to go live with her mother. If it's a threat, that means my mother-in-law will come and live with us."