#3 on my list is the lunch counter at Town & Country Rexall. A drug store grill and fountain. Sadly it's no longer there, and the old couple that ran it are probably dead now. Damn they made a perfect soda fountain burger.
#4 would be Dyer's Hamburgers in Memphis. I think they've gone trendy and moved to Beale St. now, but in the old days it was a working class dive near the industrial district. They had a huge skillet in which the burgers were deep fat fried. They'd pound the patty flat, drop it into the grease, and it'd sink. When it floated back to the top it was done. Then they'd slap it on a cold bun with cheese, mustard, pickle, and a 1/4" thick slice of white onion. Damn it was good. Not good for your arteries, though, I'm sure it was a cholesterol nightmare. The kicker was that they never changed the oil. Ever. They just added to it when it got low. Supposedly the oil in that skillet dated back to before WWII. They also offered what they called a "Double Dip", which meant that after the hamburger was cooked and placed on the bun, the whole thing went back into the oil for another round. I never saw anyone order that, and certainly never had the nerve to try it myself.