People who "black out"

"It's funny how all the kids around here claim they black out when they get into a fight, someone who was about to get into a fight was saying he was gonna black out..until I gave him a nipple twister half way through...then he screamed like a girl." - Karate Instructor at my school.

Basically in this day and age, the teen group has 3 major points to their violent aspect on life.

• When arguging they must have the last word and continually shout the same thing over and over again, such as "ARE YOU SERIOUS?! ARE YOU SERIOUS?! ARE YOU SERIOUS?! ARE YOU SERIOUS?! ARE YOU SERIOUS?!" or "YUP WHATEVER YUP YUP WHATEVER YUP"
  
• They continually "black out" when they get angry. An incredible hulk, if you will.
  
• It's always "Nah but for real, I told *insert kid name here* it was whatever"
  

Not sure if it's the same for all of you, but that's pretty much how it is around here. With the "gangster" kids and the "thugs" anyway.
Also note that I once was a "gangster" kid, dawning full Makaveli attires and running with some bad people. Don't do that crapanymore, got better plans in life basically.

But This topic is based mostly around point number two.
People always claim, that they black out.

"Nah for real if he wants to fight its whateva but you kno I might black out so I might kill someone"

It's uttered by anyone before they get into a fight, heck I'll even admit, there was a time when I've said it myself. Blacking out seems to be the new Pokemon. I don't quite understand it. When a scenario occurred, a karate instructor at my school put the theory to the test. According to most kids, when one blacks out they don't feel anything, call it a real life Super Sayian if you want, but they get all aggressive and what not. After learning of a fight, the karate teacher at my school followed the kids, didn't get security involved yet..but as he followed him, and taped it for evidence (and let our class hear the funny footage) the kid kept saying the same thing over and over, "Nah for real I don't wanna black out on him though, I don't wanna deal wit dat shit."
So finally the fight breaks out, I was at lunch during this so I'm an eye witness, and was called by security because I knew one of them. The kid apparently "Blacked out" so the karate teacher runs up, and literally grabs the boy's nipple and begins to twist it. The kid screams and apparently that was that.

So now that you've heard my rant, what's your opinion. Do people black out? Do you think it's legit or an excuse. Obviously SOME people really do, but what are your opinions on this?

Mind you, I expect all of the people who type like this is AIM to say that it's real and it's happened to them.