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Throw two balls per round. Call out which cup you are going to hit before you throw. Give the losing team one last turn after a team has won. Make a bounce shot count for 2 cups.

Article:
There are many variations to the rules of beer pong. In this variation, the same team continues throwing 2 balls per round until there is a miss. After the turn is completed, the opposite team throws at the first team's cups, and the process repeats. This is one of the most common variations on beer pong. If you hit the cup you called, your opponent drinks that cup. If you miss your target and it goes in the wrong cup, it counts as a miss, and that cup remains on the table. The opposing team gets a last turn; this is called a “rebuttal.” They keep shooting until they miss, at which time the game is over. If they make the ball into all of the opposing teams’ cups in their last turn, then a 3 cup overtime is played. Now, the teams compete in sudden death to figure out the final winner. In this variation, a bounce shot counts as 2 cups, and the player that made the shot can pick the other cup that he/she wants to be removed.