"GG, Surrender at 20"
When more than one teammate keeps whining in chat and spamming "ff" or "surrender at 20," I know the game is most likely lost. The only reason I vote yes when one of the whiners starts a surrender vote is that I know that we are most likely going to lose with that attitude, and even if we do end up winning, I know it just won't be a fun game for me when I have to deal with negative spam and discouraging flaming throughout the game.
Seriously, folks... attitude is at least half the way to victory. You lose the game when you give up and tell yourself that it's lost even if you have a good lead. I think people who keep spamming "ff" every other game should be punished and banned if they keep up this behavior. They just ruin games and discourage their whole team.
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, or a fed enemy
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, and a jungle that plays League Of Ganks Not Even Once, I know that the game is over due to its snowbally nature.