Beer Pong Rule : Losing Team Drinks
Losing team drinks.
This is one of the rules that can be broken if the opposing team gives the okay. If you are not 
one of the best beer pong players, then you have to ask about this rule before you start the play. You do not want to be the ASS of the party by hurling before the party even starts.
The losing team has to drink the remaining beers from the winning team’s side. This includes drinking any beers that were made during the rebuttal process (defined below), assuming an overtime wasn’t forced.
Warning: While this should probably go without saying drinking too much too quickly can cause a bad stomach ache … or worse. If you’re concerned that finishing the cups of the team that just beat you may inhibit your ability to play anymore games that night, then the reasonable thing for your opponents to do is to give you a pass this time.
Exception: If you’re low on beer and preserving the winning team’s beer for the next game will allow everyone to play more games then by all means suspend the enforcement of this rule.