We only tip at a bar, restaurant or if food is delivered to our door. We have never been to Sonic where they bring it to your car, but if we had we would tip. Everyone who tips because they box up your order, do you tip at the store because the bagger bagged your groceries? Or do you tip at the department store because the associate wrapped your purchases in tissue paper and put the items, boxes and receipt in the bag? I tip very well when I get a service rendered, i.e. a manicure, hair done, etc. but will not tip every tom dick and harry just because. To each their own I suppose and yes I used to bus tables when I was younger and worked at a hamburger place; very few if any people tipped.