On a recent visit to Athens, my friend took me to The Grill. It's right across the street from the University of Georgia campus. The theme is '50s and well-earned. This place has been in town for a long time.
A good milkshake is relatively hard to find and The Grill knows how to make a good shake. It was very creamy. The chocolate note was appropriate, not overwhelming.
They are also famous for their burgers. The burger very meaty and tender and it comes with all the appropriate appointments. The fries are very thick and quite good.