"Some people believe football is a matter of life and death, I am very disappointed with that attitude. I can assure you it is much, much more important than that"
-- Bill Shankly
You don't care about the quality of the passing, the skills on display, or the individual brilliance. The only thing that matters is that the ball crosses the line between the goalposts, and twice at that. The tears that slowly begin to roll when it looks like it's all over, the look of despair that turns into joy (and vice versa for the United fans -- a bonus if you're a staunch anybody-but-United guy like me), Aguero's shirtless run towards the corner flag, Joey Hart terminating the interview on account of becoming overwhelmed by the situation, the commentator's schadenfreude ("How will the fans face somebody in a red shirt this evening? How will they have the moral fiber to get up tomorrow morning and go to work...?" Fuck you.) turning into astonishment.
The Beautiful Game? No, but this is football.
On a personal note, I'm not even a City fan, but the euphoria I felt when they scored the winner was comparable to what I felt when Del Piero scored in the 2006 World Cup semi-final.
Oh, and by the way, I stubbed my toe quite hard when I jumped up from the couch to celebrate. Still hurts, but totally worth it.