People are drinking a lot more Sam Adams Lager lately. And Wall Street has noticed. Boston Beer's (NYSE:SAM) shares are up 20% since it announced its earnings report last week that included a 23% bounce in sales.

Yes, the company saw more success with its popular Angry Orchard cider. However, the real surprise was that Sam Adams Lager, its flagship brand, flew off the shelves during the quarter as well. That hasn't been the case lately, as management tagged the Sam Adams brew with the blame for holding back sales growth when compared to newer brands like Angry Orchard and Twisted Tea.

In the video below, Fool contributor Demitrios Kalogeropoulos discusses Boston Beer's great quarter, and why even the company's raised guidance for 2013 may be too conservative.