There’s this great clip from the Justice League Unlimited cartoon (and by clip I mean, of course there’s a whole episode, but I’m only referencing this part) where the Flash and Lex Luthor switch bodies (episode titled: “The Great Brain Robbery”) and Lex Luthor takes the opportunity to find out who the Flash really is. Even sans mask he has no idea. Just because someone has a secret identity, doesn’t mean they’re anyone important.