I knew a lot of kids who would rage and throw controllers and even systems, depending on how well off their family was and how terrible their parents were. Wrestling games were seemingly predisposed towards this, for whatever reason and I see a lot of those comments supporting that here as well.
The only time I ever got close to "raging" was with a buddy of mine, we were both into TF really hardcore, but he was into the clan scene and tournaments and I was more of a community and pub player. He swore a certain player was cheating, and I'd watch my buddy play against him in matches and it looked like stereotypical wallhack and aimbot behavior to me. Aside from the unreal raw aiming skill and reaction times, he'd interrupt his movements and double back for no apparent reason consistently and always in just enough time to cut off the attacking squad in ctf.
This player always denied the allegations and we ended bullshitting with him on IRC and somehow acquiring & looking up his address on the mapquest of the day and planning to drive up there, knock on his door, drag him out into his front lawn and beat the shit out of him. Hey, it was only 2 hours away, why not?
A month later he ended up getting found guilty of using proxy bots and was banned from all competitions from then out. I remember reflecting at the time that we both seriously considered having an assault and battery charge on our permanent records was going to be worth it to teach this cheating douche a lesson. That was something like 12 years ago.
I read about the kid last year who got stabbed for using wallhacks in CS at a LAN and I remember thinking that made total sense. Sad, really.
Similarly, the worse I saw anyone ever rage in real life was at an informal CS lan party. I had played since Beta 1 and my buddy had all these johnny come lately 1.0> players over and they just couldn't hang, in the worst ways. By the end of the night we were running 7 v 1s on de_prodigy for fucks sake, and I was still smoking these guys. The one was a real try hard and near the fourth round I said fuck it and bought a para to really toy with them.
The self proclaimed best player of the bunch is the last player and knows my location, I'm camping by CT spawn bombsite near ladder & across from the pipes, so he literally jumps around the corner with his MP5 full auto and I crouch under his fire, swing my para and one-shot him in the forehead. Not in a stream of bullets, not as I wildly swing my mouse, just a calm-as-a-bomb arc motion and "click" single-shot to the fucking face with all the other CT's dead and spectating.
The kid literally screams in agony and in one swift motion bolts upright out of his chair while hurling his CRT monitor off the back of the folding table, picks up his keys and storms out of the room. We hear the front door slam shut, his care fire up and he peels out of the driveway. I was crying laughing, to this day it still makes me smirk thinking of how bad he lost it over some stupid little screw off session.
The best part was this was supposed to be our "warm up" the night before a big local lan tourney and we all had to play as a cohesive five man team the next day, and I had just met these kids. He slept at his moms and we met him at the tourney the next day, where he went negative every match.