Here are some of mine
So one time in Griffball I ran into a team that was some guys from Mexico, and they kept talking in Spanish. They also had one guy who was just some English guy. The conversation went like this:

Spanish Guy: (something in Spanish)
English Guy: What you say to me?
Spanish Guy: (something in Spanish)
English Guy: ARE YOU A TERRORIST?
Spanish Guy: (something in Spanish, then laughing)
English Guy: I'll have you know my bro is in Iraq and he will kick your a.
Spanish Guy: (something in Spanish)
English Guy: Man, I bet the government is going to kill all you stupid jihads. Seriously, you guys are dicks to us true Americans. You're like, afraid of our freedom. Stupid fa**ots.
Me: Uh, dude? These guys are Spanish.
English Guy: The cheeky bastards.
Spanish Guy: (something in Spanish)
English Guy: SHUT UP! YOU BITCHES BETTER RUN WHEN AMERICA COMES A KNOCKING!
Me: Ok, you can stop trolling now. It's not really funny anymore.
English Guy: What the f*ck's a troll?

and my favorite (this was back when I thought there was no god)
I had this one little kid in GTA4 who had a microphone, and all his friends talking in the background. One of them shouts out 'God wont like that.', presumably because one of them swore, so I said that God isn't real and cant hurt you. Suddenly the kid starts screaming extremely loud and high pitched, the mic cuts off, and comes back 3 minutes later with:

"If you ever talk to my son again I'm gonna find your a and cut open your throat."

Kid then promptly leaves and I get negative rep for it.

.....................................................damn kids

Kid: You guys all suck at this game. I bet I could kick all of your a$$e$.

Long story short, he challenged the five of us to a one on five match in Call of Duty and lost miserably.

Erazor wrote:Kid: You guys all suck at this game. I bet I could kick all of your a$$e$.

Long story short, he challenged the five of us to a one on five match in Call of Duty and lost miserably.

I wish I could have seen that
What did he say afterward?

NeoMetalSonic wrote:

Erazor wrote:Kid: You guys all suck at this game. I bet I could kick all of your a$$e$.

Long story short, he challenged the five of us to a one on five match in Call of Duty and lost miserably.

I wish I could have seen that
What did he say afterward?

somthing along the lines of

..... That was not fair you A**es cheated you used hacked weapons you A**es really need to play F***in fair F***ers

am i right? or did he leave?

This isn't on xbox live,but it's in an arcade over here.I am playing King of fighters 2002,and a little kid walks up and says.
Little Kid:CAN I PLAY!? (Yelling)
Me:Go to the 2nd player.
Little Kid:(inserts his credit)
(Game goes to character select)
(We pick our characters and then it starts.)
(Now,this kid SUCKS at fighting games so I tell him to read the move sheets near the control panel.)
(Then he keeps doing a cheap move)
Me:Ok,guess what?
Little Kid:What?
(I KO him.)
Then he keeps inserting credits wanting to play again,even though I have to go.
Then,his mother comes to me and says: "I saw what you did to my son,you cheated."
Me:You weren't even there.
Little kid's mom:My son never lies and if he says you cheated,you cheated.
Me:Ok,look lady,we all know how badly you want your son's quarter back,but it isn't going to happen.
(Little Kid's mom brings over the owner)
Owner:What's going on?
Little Kid's Mom:This guy was cheating against my son.I think you should kick him out for causing a disturbance.
Owner (pulls me aside)
Owner:Ok,what really happened?
Me:Kof2002,I tried to teach the kid some combos,he did a cheap move over and over so I blocked it and KOed him.
(Owner kicks out the son and mother.)
And that is why sons and mothers should STAY THE F*** OUT OF ARCADES!

People with mental disabilities should not be aloud to play videogames.

NeoMetalSonic wrote:

Erazor wrote:Kid: You guys all suck at this game. I bet I could kick all of your a$$e$.

Long story short, he challenged the five of us to a one on five match in Call of Duty and lost miserably.

I wish I could have seen that
What did he say afterward?

He kept asking for rematches. We accepted two of his rematches and beat him both times. The third time I joined his team and kept Team Killing him until he left. Of course there was plenty of swearing and unfounded insults but it was fun.

its not the dumbest thing i have heard but during a halo match some kid forgot to mute his mic he was stood still and you could hear him on his mic he was jacking off sorry to say its was f**king funny

this was on tf2 and wasnt dumb but hilarious!

little kid: stop killing me!

me:how else should i lay then

admin gypsy joe: one sec

*little kid's name changes to mangina*

little kid:whats a mangina?

gypsy: it's like a Virginia for gay people

little kid:change it back!

gypsy:why should I mangina?

little kid: CHANGE IT BACK!!

gypsy: ok shut up Ill change it back

*mangina has changed name to big hairy mangina*

Little kid: Change it back!!!

Gypsy: why when you have a big hairy mangina

*vote goes out Change arcterus name back?*

*vote finished 90% no*

*big hairy mangina's name changed to big hairy vagina*

gypsy: there now it's a little more realistic

(gypsy keeps going back and forth until the little kid's friend comes by and we make fun of her)

then the map changes to best in class and everything goes back to normal

Someone name calling, saying he'll own us and crap in the lobby, then getting his a kicked. Even funnier when he singles someone out, then they end up having the best statistics when it's over.

All of these happened when playing Halo 2:

-On a Team CTF, one dude on my team kept getting up in my face with a Shotgun, saying "How do you like me now?" among other random crap. I told him to bugger off, then he shot me at point-blank range. I respawned, killed him and left the game.

-Playing with a teammate with the gamertag "White Supremecy" He didn't have a mic.

-My then-roommate played and used a fake accent reminiscent of Kim Jong Il from "Team America," even leading the whole group of players in a chorus of "I'm So Ronery."

Phantom wrote:
-On a Team CTF, one dude on my team kept getting up in my face with a Shotgun, saying "How do you like me now?" among other random crap. I told him to bugger off, then he shot me at point-blank range. I respawned, killed him and left the game.

You could have done better. You should have tricked him into doing it again and have him kicked.

I witnessed a guy on Halo 3 curse out another player, and then discover it was his girlfriend.

Worst Halo 3 pick up lines

Girl: Hey

Guy 1: Sup baby wanna see my sniper? I'll zoom in for ya.

Girl: Wow you guys are retards...

Guy 2: Please give me your e-mail!

Me: Nerds....

Guy 1: Shut up little kid i'll f**king own you!

Girl: I'd like to see this!

*3 games later*

Girl: Wow he owned you...

Guy 1 and 2: Whatever little p*ss* you just got lucky...

*Guy 1 and 2 leave game*

Me: So whats up?

Girl: Nothin much wanna play matchmakin?

Me: Gotta go soon...

Girl: Heres my e-mail and GT see ya soon

*girl logs off*

Me: WOOT

Post the email for proof