Is it normal to want to punch someone out over an argument?

Just remember internet bullies are low self-esteem geeks...

I'm the same. I get heated easily. Hard not to.

I never get in to it on the internet. Its just such an uneven playing field. There are no winners in a troll battle, only losers for letting the troll enrage you.
I have found the best way to deal with a Troll is to have everyone convince the guy that they have "shut him off" in their Control Panel...you know, set on "Ignore" as many (all should have this feature) forums have like IMDB.com
If you can actually convince a Troll that everyone has him on "ignore" and not one single person is reading his posts, well that enrages them far far worse than any name calling, threats or a fight. Trolls live to get noticed and cussed at. That fuels them.
This only works short term. Invariably somebody caves and cant stand it anymore and blows up at the troll in a scathing post which is music to their ears. We were soo close to getting everybody to actually set this guy on "ignore". He was almost totally convinced that not one single person was reading his venom since we had all greed not to answer this guy and to actually set him on "ignore: so no one would "loose it" and actually reply to his crap.
So close. One girl had to peek....just had to.. She took him off the "ignore" setting and got so upset that she wrote a long scathing post.

It was like squirting gasoline on a fire!! The troll got tremendous energy from her tirade and never did leave. Sigh. It will work, guaranteed 100%. A troll will eventually go away if he or she is convinced that every member has the troll on Ignore. It takes one person a single post to undue weeks worth of work.... Oh. well.
I was far more angry at the girl who answered the troll than the actual trouble maker!
Trust me. Ignoring a troll is far more rewarding than the most scathing of replies.

Arguing on the internet is like competing in the Special Olympics. Win or loose, you are still a retard.

Yes, its normal to FEEL that way. I have felt such unbridaled anger in the past that I am shocked by the deepness and drkness of the feelings.
But 9.9 times out of 10 I never ACT on these feelings. I will often DO something about it, but in a manner that I can live with the next day and in the years after the event, what ever it is that I end up doing.

I am so grateful time after time that I did NOT fly off the handle and make things even worse.
I almost came to blows the other day. It takes A LOT to get me that riled thses days. I am glad it did not come to actual violence, but I am still not sorry about clearing the air and letting the other person know face to face the error of his ways.
I am a BIG guy and only the really drunk or the incredibly stupid will pick a fight with me face to face. So, I have been blessed in that regard.
This guy's nick name IS "The Idiot" and he was also drunk on top of being one of the stupidiest people I have ever known. Friend of my Landlord....kind of off limits for a physical pounding. It was as close as I gave come in over 10 years.
I try to feel more SORRY for idiots like this, rather than hatred. That is the only way I can live with myself.
The BEST policy really IS Anger Management. Manage those feelings. You will lead a much better life.

Completely normal, the first thing that comes to my head with most negative situations is violence.

This is utterly normal... I feel exactly the same way at times, but, I realize that certain trolls get their jollies out of being fed so I choose to either starve them, report them, or decimate them within the specified forum's guidelines. People that bully others on the Internet or in person almost ALWAYS have something wrong with them that they are attempting to overcompensate for so consider the source and then (if possible)ignore it.