Anger

Anger is an emotion, like any other.  It is healthy to release your anger in productive ways.  As long as your fist doesn't come in contact with the other person's nose, you can punch and kick and flail all you want.  This thought was brought on by actor Christian Bale's recent blow-up over a distraction during one of his scenes. 
I chose to insert the techno remix to keep things a little bit more lighthearted. :)
Understandably, Bale was irate over the interruption to the emotional scene he was shooting at the time.  As an actor, you must become the character you play, feeling their emotion and working yourself up emotionally to catch the drama of whatever situation your character is placed in.  This takes time and concentration.  I can understand that a random guy walking through the middle of a scene you have worked hard to perfect would upset you.  As to Bale's foul language and relentless insults, I wonder if perhaps he was still in character. 
Anger is an emotion that I find myself feeling very inwardly.  I am not often observed openly yelling or throwing fits about something.  Instead, I feel my anger as a mix of anxiety and sadness, unless my anger is at myself.  In that case, if I am alone with my feelings, I rant and rave at the mirror, or my stuffed animals, or the walls about how pissed I am that things are going the way they are.  I rarely hurt myself anymore, but if I am angry at myself for hurting someone I love, I tend to take that out on myself physically.  In the most recent example, I told someone I care for that there was someone else that I loved.  It hurt him and I knew it, and it was the hardest thing for me to bear.