Privacy could be a rare and precious thing for an A-list film star such as Joseph Gordon-Levitt, who has spent the majority of his life on the big screen.
However it seems Gordon-Levitt has more freedom than that afforded to many people.
He can, for instance, set up a drum kit on the platform of a subway station in New York, vigorously play it, and few people will turn their heads.
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Many people noticed on Facebook that nobody had clocked the actor, or at least if they had, they weren't letting on.