Peloponnesian War is a drinking game involving two teams consisting of five or more players, each with their own keg of beer. The contest is to finish your keg of beer first. Unlike other drinking games, vomiting is not against the rules, and it is encouraged to vomit on the other team.
In the movie American Pie Presents: Beta House, the members of BÄÎ (Beta House) and EÓK (Geek House) competed in the Peloponnesian War. This event was part of their "Greek Olympiad".