Meatloaf didn't come up, but I like it as a counter-example. I think, based on our discussion, that he would call meatloaf sandwich a "sandwich" rather than a "burger"; I know I would. So then, what is the difference there? The form factor? ("slice" of ground meat versus "patty" of ground meat) The use of a bun? (but one can eat hamburgers on sliced bread -- I had one for dinner yesterday) Hmm, interesting wrinke.