Happens every year. The season ends and that's it. It's just ... over. No more baseball until March, when the World Baseball Classic will be played (for the first time despite the "classic").
You wait 85+ years for the Sox to win a World Series and then two come along in consecutive years. First it was the Red Sox and now the White Sox, the second city's generally unloved second team. They're celebrating their first championship since 1917.
UPDATE - 12:50pm: I presume this Irish fan was happy about Chicago's big win (& tired if he stayed up for all of Game 3, which ended around 7:40am here).