Have you heard of Brett Cohen? You know, Brett Cohen! The actor! No, wait - is he a musician? Who cares?!
Don't worry, you're not supposed to have heard of Brett Cohen, because he's not famous. Well, except he is now - slightly - as a result of the video above.
A few weeks ago, Cohen walked around New York City, trying to fool people into thinking he was famous. And it worked.
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Click on the video above to see how he managed not just to create quite a stir, but also make a lot of New Yorkers sound very, very stupid indeed.
A searing indictment of celebrity culture? Or just a silly Sacha Baron Cohen-style prank? Either way, it's rather brilliant - as are these other classic YouTube pranks: