We cross the world to learn about home

We were enjoying lunch in a bar chosen for its beer selection; they had Chimay on tap. Jack was in heaven. We were sitting at a table next to a window when we start noticing that there was a veritable parade of people outside posing for photos in front of our window. After awhile we determined that the draw was a tower of Duff beer on display in our window. Not knowing what Duff beer was, we were bewildered. Most of the folks who were showing such delight in the photo op appeared to be young men. So we presumed that this Duff beer must be frat boy swill. We had to come home and Google it to understand.