Get the PDF and ask yourself these questions every time you're flustered. ---
The statement at the top, "Why are you always so happy? Because it feels better!" can be attributed to the Dalai Lama. I think what he meant, was that happiness can be a conscious choice.
Strangely, my initial reaction was to ponder if the converse held any truth. Upon reflection of my previous experiences, I really do think that anger can feel better.
That's when I remember some of my biggest arguments, and how I wished they would never end. In that way, I was experiencing an artificial high without having to exert any added cognitive effort. My mind was able to focus solely at the task at hand: to debunk the other person's arguments.
It's a funny sort of "flow" state to be in, where you're actively engaged and emotional. I can see why people seek it out (albeit subconsciously).
I think that the ability to become angry is a useful one, and I'd be damned if I'd suggest eliminating this remarkable ability; anger seems to be the trigger of many a revolution.
But I do think that if you're gonna get angry, get it under control, and make it feel good.