Repetition helps exaggerate a point that the author is trying to convey. It highlights the main idea of what that character in the story is trying to let readers understand when stating such phrases.
Answer:
the Gummy Bear dude, from the song "Oh I'm a gummy bear, oh yes I'm a gummy Bear"
The correct answer would more than likely be Uncle Sam
By whom this chair is broken IS the passive voice of "who broke this chair"