Keep your anger in check. Always.
When the mood during your interaction with others starts to show strain, check yourself. Pause and take a break. Don't let your anger get in the way to whatever you are trying to achieve. If the other person keep going on in an aggressive manner, say something completely different from the matter being discussed to disarm him. Break his line of thought. Keep you peace of mind.
Never get caught in the heat of the moment. Keep telling yourself to be cool. Remember, a moment of madness may lead to lifetime of misery.