Beer Pong has it's roots in ping pong. That's the traditional table, but
any table that's rather large will do. The longer the table, the more
challenge. The table is divided in half by a line.

---2-----------------
                                                    |           O O
O         |
                                                    |           xO
O           |
                                                    |
O             |

|                               |

|                               |

|                               |

|                               |
|                                                                   |
   ________________________________ 
|                                                                   |
X                 |

|                               |

|                               |

|                               |

|                               |
                                                    |
O             |
                                                    |             O
O          |
                                                    |           O  O
O       |

--1------------------

And a beer is put in in each of the O's designated. Typically they are
all scrunched together, but they can be spaced as show for a more
difficult game. Team one takes a ping pong ball, also called a beer pong
ball, and bounces it before their side of the line to try to get it into
team two's cups. If it goes in, someone from team two must drink what's
in the cup(cups are 16 oz. but usually only a quater full of
beer-otherwise it could get painfull after a few games). Then it is team
two's turn to try to get it into team one's cup by bouncing it on their
side of the line. Shots always alternate teams whether it goes in or
not. To win, you must get the other team's cups gone before yours are
gone. A typical trajectory is Xx for a team one shot, the ball is only
fair if it bounces once on the table and then into a cup, not allowed
two bounces on the table or more.

Oh, and whoever "loses" drinks what's left on the "winner's" side.
Winner's take on the next challenger.
                                                Your's,
                                                   -Rick Palmer-