The modern classic sitcom Seinfeld has remained a cultural touchstone since its final episode aired 25 years ago. The series, created by Jerry Seinfeld and Larry David, is idiosyncratic and specific in its view of the world, so much so that it seems infeasible that it could have been just completely made up. No matter how outrageous and deplorable the characters and their antics became, the "show about nothing" counted on mundane relatability to connect with audiences, and the show's creators mined real life to craft many of its stories and characters. Even Seinfeld's least relatable component, the eccentric next-door neighbor Cosmo Kramer, is based directly on a real person, fantastical as that may sound. Somewhere, the real Kramer walks among us.