It's pretty difficult to calm down when you're pissed off and your blood is pumping and all you want to do is carry out every evil thought that enters your mind, trust me I know. But at the same time, I anything more than the actions I take whenever I'm mad. So I took advise from a friend and started practicing breathing exercises.

Anytime something or someone upsets me, I walk away and take multiple deep breaths while also calculating the ramifications of any anger I take when I'm angry. That usually helps me calm down and if the anger persists then I just leave the environment entirely or simply go take a nap.