I've eaten a lot of burgers in my time, but the one I had at Harold's was by far the best I've ever eaten. The meat was seasoned nicely, the condiments were fresh and plentiful, and the fries were to die for. Nearly brought me to tears.
Pros: Burgers straight from heaven, fries that made me weep, fun atmosphere, great value.
Cons: The building is a touch small...but once you're over the surprise, it adds to the charm.