You'd be surprised. The actor for Superman was filming, he was very famous, he went into the restaurant dressed as Superman and was surrounded by fans. Then he went into a restaurant dressed as Clark Kent and no one recognized him. Charlie Chaplin lost in a Charlie Chaplin lookalike contest because he didn't look enough like Charlie Chaplin. Actually, a lot of celebs have lost look alike contests of themselves, lol.
I learned about it on Tumblr. Here's the original post, which has more examples, if you're interested.
https://onlyontuesdays88.tumblr.com/post/164425233470/evidence-against-the-argument-that-supermans
why do protagonists always have like lv 100 obliviousness
like bro, he has the same exact face, ATLEAST suspect that its him ._.