As a leader, you are on display every day and in every exchange and how you conduct yourself is observed very closely by all around you. Lose your cool, snap at a subordinate, act like the spoiled tennis player above, and you not only fail to build your professional credibility, you damage it. Alternatively, if you recognize that the moment in time when things are heading the wrong way is a remarkable opportunity to build credibility and create powerful learning opportunities for your team members, you will conduct yourself with grace under fire.