Well sometimes I have to because of my anger management problems.  It's either quit, or lose a controller or have a hole in the wall or both.

Mario Kart.

He was obviously kidding, in case you missed the ";)".

I dont play online all that much, and when I do I play to pass the time and/or to practice. So no, I never quit, no matter how badly they beat me

lol

If it's not hard enough, I quit. It's a waste of time otherwise and will just prolong the disappointment. ~_n

Noup...Well if it is waste of time, I do quit sometime.

Like while playing Final fantasy XIII.

FF11 - Grinding, I'd sometimes unplug my cat5 cable :P

Getting hammered in a game, you can put the controller down and wait for the game to finish. Quitting is the height of bad sportsmanship. You may as well just give up and just see the game out. Place the controller down during an online match and leave the room. It is only a game. Better luck next time. 

You can actually learn more through failure and defeat than winning. Winning all the time is not fun at all. Hey it is good to let your friend or family win but do not let on you let them beat you. 

You can quit a game anonymously with no repercussions. If you quit a game on a friend or family member it may result in a conflict. By quitting and acting like a bad sport they may never play against you again. As a child you are losing a game of monopoly or chess or another board game, you knock the game board over and you call the other person a cheat. 

only if RL thing pops up,  or i get bored or there is cheats

i like playing in a team losing as it mixes up a bit and gives and competition for once.