Charlie Chaplin and The Joker


I found The Joker from Charlie Chaplin's film The Great Dictator.

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The Joker First Public Appearance: April 25, 1940
(From https://en.wikipedia.org/wiki/Joker_(comics))

The Great Dictator Release Date: October 15, 1940
(From https://en.wikipedia.org/wiki/The_Great_Dictator)

Although The Joker appeared earlier than The Great Dictator, The Great Dictator was filmed even earlier.

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Who is copying the other one?