Name one memorable episode of the late-1980s NBC sitcom A Different World. Go ahead, I’ll wait. Sure, the Cosby Show spinoff featured, in the first of its six seasons, both Lisa Bonet and Marisa Tomei, two fascinating actresses heading in diametrically opposite career directions. And yes, the character name Dwayne Wayne will forever ring a bell for children of Ronald Reagan’s America. Having managed to get by on five channels until well into the 1990s, I can tell you precisely where A Different World was set (the fictional black college Hillman) and which of Bonet’s on-screen parents were meant to have been graduates (both). I can even hum the theme song. I just can’t recall a single subplot, joke, set piece, or lesson learned.