When I was in my early teens, I used to TK a lot.  I mean a lot.  I even joined up a clan called TKO (Team Killers Online) to help with my lust for TKing. 
 
Growing up, I just forgotten to do it, as I would be more focused on winning rather than just pissing people off. 
 
I remember in SOCOM, oh man SOCOM, I used to TK EVERYONE.  I popped a bullet into everyone's head and then nade myself.  It was always hilarious to see the reaction from the other team go like:  "uh....what the hell just happened".  I told them a demon took over, always worked.  :D 
 
Man, Team Killing.  Anyone got some good stories? 

People who team kill are cunts.

People who team kill are cunts.

" People who team kill are cunts. "

" People who team kill are cunts. "

I had a 49 in on Halo 3 and decided that I was going to make another account. De-ranking at a level where everyone was taking the game too seriously and besides, it is MLG, was hilarious. 
 
I remember a particular game I was in, I chased two teammates around the map just peppering them with fire keep their shields from recharging. Apparently, the two guys I was annoying thought that the fourth guy was in my party and began to verbally abuse him the entire match. Their banter was awesome...

Not quite teamkilling, but in the game The Ship it was hilariously easy to grief people. You were penalized heavily for killing anyone who wasn't your target or hunter. If you convinced someone that you were their hunter (throwing a weapon at them but not hitting, drawing a weapon around them when away from cameras, attacking but missing, etc) and provoked them into killing you, you could obliterate their score and even get them kicked.

I don't know about you guys, but I think completely spoiling someone's experience is H I L A R I O U S

" People who team kill are cunts. "

" People who team kill are cunts. "

" @Red12b

People who team kill are cunts.

"

I hate to jump on the band wagon but greifing like that reeeeeally fucking sucks, dude.

" @Red12b said:

" People who team kill are cunts. "

"

I'm a cunt

A guy team killed me in MW2 so i killed him for the entire match and then proceeded to follow him into 6 other games and kill him making him leave them as well. twas a good time

" People who team kill are cunts. "

My friend came over once to play the Halo 3 beta, when it came out. As soon as the match started, we turned to face each other, and then without any words spoken we instantly started killing all of our teammates and got banned instantly. 
 
It was funny as hell. 
 
I don't TK Anymore but I'm not going to lie and say I never found it hilarious. I guess I'm a cunt.

I admit, I used to TK like crazy in Halo 2, but mainly because everyone playing had that "i'm so bad ass at this game, you suck noob" mentality so they deserved it. Especially those games where people partied up with a high rank just to reap the rewards, I would do everything I could to make us lose, and it worked. But I don't approve of it anymore.

Cats who team kill are jive turkeys.

" People who team kill are cunts.

@CaptainObvious said:

" Cats who team kill are jive turkeys. "

" People who team kill are cunts. "

" People who team kill are cunts. "

I'll just leave this here...
 

Damn, teenage you was a dick. Here's every time anyone has ever intentionally killed me summed up in one sentence: "A twelve year old shot me in the back of head several times and proceeded to crouch up and down on my corpse babbling incoherently into the microphone".

" People who team kill are cunts. "

" People who team kill are cunts. "

" @Red12b said:

" People who team kill are cunts. "

"