The men celebrate at Moe's Tavern, but relationships sour when Peter introduces Homer to Pawtucket Patriot ale. The drink is revealed to be an imitation of Duff Beer with a new label. Duff, represented by the Blue Haired Lawyer, files a lawsuit against Pawtucket Brewery for patent infringement, with Peter forced to defend the brewery to save Quahog. Fred Flintstone presides over the case. Similar characters from both shows interact with each other. Fred rules in favor of Duff Beer, but declares that both Pawtucket Patriot Ale and Duff Beer are imitations of Bud Rock. (thetvdb.com)