need ideas for gambling while at the baseball game

[Skipbidder]

Tossup about whether this post goes here or Sports Betting.
I'm Going to Wrigley with a buddy of mine tomorrow. Playing the Reds. Harang on the mound vs. Zambrano. Both of us are currently fairly casual fans, but used to be much more interested. He'll be rooting for the Cubs, while I'll be rooting against (quietly, I suspect...and only because I'm hoping to Milwaukee make the playoffs). Looking for some ideas about gambling games or prop bets that can be played during the game. Thanks.