If you're ever in Wrigleyville for a Cubs game, the day's not over until you hit the bars afterwards. That is, if you're lucky enough to get in.
My personal favorite is Murphy's, but there are so many bars in the area that you can't go wrong.
Beers are a little on the expensive side. We paid $4 for a Bud Light can. And you can't leave without an Old Style draft.