An oyster stout is just like a traditional stout style, but for one important characteristic. Somewhere in its creation it has been touched by an oyster. Tradition tells us that in Victorian England, oysters were served with beer. And from that came permutations of adding shells and/or oyster meat to the brew. Gimmick or flavor, you decide. For beers with big flavors, brewers might throw in the entire oyster. While beers with more subtle flavors just the shells are added — brinery, mineral, subtlety or bold. In Shakespeare's play 'The Merry Wives of Windsor', Pistol declared “Why, then, the world's mine oyster, which I with sword will open.” Some have interpreted this to mean, “I have money, therefore all the good things of the world are available to me.” I don't know about all of that, but I do like the beer… and this shirt. Read about one interesting variation, the Rocky Mountain Oyster Stout.