On August 22, 1985, a woman with a She-Ra mane and a latex dress appeared on Late Night With David Letterman. Letterman, still spiky in his salad days at NBC, was charmed but befuddled as he interviewed her. Unlike many of his guests that season — Johnny Cash, Teri Garr, Eddie Murphy — Dianne Brill’s qualification for the spotlight was hard to describe. True, her photograph was on the cover of that morning’s New York Post; Letterman had a copy. But still, he seemed unsure who she was. Or, as he was compelled to ask her about her front-page placement, “Why are you there?”