Five Guys is really blowing up right now. I'd like to see the figures on exactly how fast they're growing, but I see new Five Guys chains popping up everywhere and they seem to be extremely popular.
I used to live in DC and miss it so much. It's a family owned business (last time I checked) and when the founders' kids were about to graduate from high school he gave them the choice: start Five Guys or go to college.
From the looks of it, they made the right decision.