Charlie Chaplin is the correct answer because he is a well-known figure in the film industry. He was a famous actor, comedian, and filmmaker during the silent film era. His iconic character, "The Tramp," is recognized worldwide. Adolf Hitler was a political leader, Errol Flynn was an actor known for his swashbuckling roles, and Robert Downey Jr. is a contemporary actor known for his portrayal of Iron Man in the Marvel Cinematic Universe. Therefore, Charlie Chaplin is the most fitting option among the given choices.