It’s one of the best things on television right now. It’s “What We Do in the Shadows,” a show that honors vampire lore while placing them in ridiculous mundane situations. A mockumentary sitcom featuring vampires might seem like an entry from TV Mad Libs, but this show (based on an indie feature film also by Jemaine Clement and Taika Waititi) uses its stellar cast and sharp writing to create a bizarre world of energy vampires, complaining familiars, new-age witches, and—the horror—local politics....