Supplies: people and lots of beer.

Have everybody divide up into two even teams.  Each team lines up
opposite each other, preferably down a long table, or just sitting on the
ground. Fill each glass full of beer and place in on the table in front of
each player. The players can not touch their glass before they are allowed.
The first players on each team start the game by drinking all of their beer
and setting the glass back on the table.  When the glass touches the table
the second person drinks his beer and sets his glass on the table. This
continues until the last beer is gone.  The first team to place their last
empty glass on the table wins. Wins what you may ask? Nothing.