Overview
Someone's unusual behavior is a red flag for something else. Find out what the real deal is, today. No, it's not your imagination -- they are not acting the way they usually act. This change in behavior cannot go without comment. For all you know, they could be testing you. Are you paying attention to them? Make a quick phone call or send a cheerful email inquiring if there is anything they want to talk about. They have been waiting for you to start the conversation.