The Seventh Inning Stretch marks
...an interesting tradition. In the 6th inning, in addition to the cute young girls carrying a tankard of draught beer on their backs, snacks or OJ, young hucksters sell balloons to the fans.
Then during the 7th inning, everyone inflates these balloons, which now resemble red or white, meter-long spermatozoa. After the team song, the balloons are released, shooting off into an orgasmic display of delight, then you see fireworks and everyone goes and smokes a cigarette.
I don't know what it does for team spirit, but it got me excited!