For 62 years, Arby's has made a business of being the odd hat in fast food. Its real product is not roast beef alone - it is a permission slip to order something stranger than another burger.
Two friends could not find a decent wing in Columbus in 1982, so they started frying their own. Four decades later the sauce list has a heat challenge, the sports bar has a takeout spinoff, and a third of the orders never sit down.