One milestone every young person looks forward to is their 21st birthday. Obtaining that age allows that young person to legally buy a 12-pack of beer at the store or a bottle of spirits at the liquor store. Before that, however, the law states that you cannot drink or buy any kind of alcoholic beverage if you are under the age of 21. Believe it or not, though, there is an exception to this law. But there is an exception to that exception, too.