Seems like almost everybody sings:

Take one down and pass it around

The way I learned it in Wisconsin was

If one of those bottles should happen to fall...

In Wisconsin, people don't actually drink beer (except during the two-week summer season in August) - beer is what they sell to everybody else. I don't know if it's still true, but there was a time when Wisconsinites drank more brandy than the rest of the United States combined. It warms the innards.
-Joe Offer, now living in California where they make the brandy-