Easily the greatest sport, ever.
Its so universal and simple, all you need is a ball and a piece of land that is vaguely flattish. I love it, I played for a while - but the team started losing people until it became about the sport, which it never was for me, so I left too.
I still love a casual game though. I can't do anything special, but I like to kick the ball
It's a good game to watch too, although I don't really care until the World Cup, or the home team is playing.