It's bad to take joking too far and anger someone.
Jack is joking with his boss Jim at the end of their shift at work.
Jack wants to make Jim irritated as payback for a previous joke played by Jim.
Jack notices that Jim is getting angry at his payback and apologizes for pushing things too far.
Jack continues to push Jim's buttons with jokes to get back at him and does not notice Jim's anger.
Jim tells Jack that it's OK, and they agree to stop playing jokes on each other.
Jim fires Jack stating that he is not a good person to work with relative to team moral.