Believe it or not, most of the messages we communicate to others are done through body language and vocal tones. Think about it for a second. If you ask someone to do you a favor and he or she responds with a bitingly sarcastic, “Sure; whatever you say,” do you think your favor is going to get done? What about if the respondent just slumps over and glares at you? In many cases, that sends a clearer message than saying anything, and it can cut off a conversation long before you’ve actually accomplished anything.