The Chicago Cubs are going into the playoffs, but fans still don't know which team they'll be playing next. See Phil Rogers, "Possible playoff matchups for Cubs" Chicago Tribune (September 22, 2008).
If you decide you want to become a fan of the Cubs, you'll need to learn what to sing at the 7th inning stretch:
This view of Wrigley Field during the final 7th inning stretch of the 2006 season:
The song turned 100 this year:
And a Yiddish version: