just thought that was worth mentioning. and i suppose that since this is a luke's diner appreciation thread, i should also say:
i love the inclusion of a place like luke's in the show. it's almost like home for lorelai and rory. they meet here and discuss important things, luke hounds them about their eating habits and how the food they consume on the premesis is likely to rot their insides and whatnot [proving even more that he cares about both of them], luke helps lorelai with business affairs, we get to see each of our dynamic SH characters at their best...it's almost like the town meetings, where the culmination of the show's characters and personalities all meet for short periods of time. i love it.
What cracks me up is that Luke is insulting his own food! He tells them to eat healthier, in other words not so much of his greasy slop?

L & R mostly eat Luke's burgers and fries, donuts or the onslaught of greasy high-cholesterol breakfast food that he prepares. I get a kick when Luke tells them to eat a vegetable once in a while... presumably not his!
Also, much of Luke & Lorelai's best banter takes place in the diner, and without it they wouldn't have developed much of a relationship. If Luke had kept it as a hardware store, Lorelai would not have much excuse to see him.