The classic regional sandwiches of the US.
My favorites: BLT, Club Sandwich (with extra Mayo on the side), Po' Boy (fried oysters). Best of all? The Thanksgiving Leftovers Sandwich.
They omitted the classic Northeastern Italian-inspired sandwich: Fried eggplant on a hard roll. And what about the ordinary tuna sandwich? I like capers on mine.
I like 'em all though - except for Fluffernutter (h/t Marginal Rev)