"You’re very tired. You’ve run out of energy, you’re desperate for the game to stop, but you need to try and remain focused and concentrate right to the end. It’s very difficult, because at this level a game is very quick, so after 90 minutes you’ve ran out of energy. [Extra-time] is when lot of mistakes come. When the body and the mind are really tired you see teams make mistakes, the game becomes a lot slower. Obviously, the two teams are desperate not to lose the game, so everyone becomes a bit edgy."
-- Steven Gerard, via FIFA.com