Jason Feifer on Instagram: "The origins of iconic marketing! @heyfeifer breaks it down: This is Nike’s first “Just Do It” ad — and although it might surprise you, it shows EXACTLY why the slogan endured. This ad appeared in 1988, and featured an 80-year-old runner named Walt Stack who ran 17 miles every day. “People ask me how I keep my teeth from chattering in the wintertime,” he says. “I leave them in my locker.” Then the slogan debuts, as a complement to Stack’s joke: “Just do it.” Here’s why