Marie Antoinette was funny I'm sure she was just misinterpreted. You know the 'Let them eat cake' line. She seems like she was kind of funny like a Chelsea Handler or Kathy Griffin type.
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You know how it is with writing. You just write what you want to write. There's no way to predict what is good or bad. You just do what you think is funny and either it works or you're finished. It's impossible to predict anything.