After Peter and Brian attend their first of thirty court mandated AA meeting they come home and complain to Lois about how boring it was. Then they realize that what was missing was beer.
But once Joe is called to the community center for a noise complaint the AA members quickly hide that they've been partying and break into song with the help of Peter and Brian.
Finally Death comes around after Peter wrecks his car thanks to drinking to show Peter what his life would be like as a complete alcoholic. And what lesson does Peter learn after all of this? That quitting isn't the way to go, moderation is key.