Communicate

The single biggest problem in communication is the illusion that is has taken place.

~George Bernard Shaw

You know what you're thinking.  You tell someone else what you're thinking.  Now what?  Does the other person understand?  Did they hear your words and infer something else?  Communicating effectively can eliminate much of the frustration you face daily.  Don't assume that communication has happened just because words were spoken.  Verify the other person's comprehension by asking questions or asking them to repeat what you said back to you in their own words.  Don't just talk, communicate.