I think it's because it's so different and it takes risks. Plus it's really smart humor. It gives the audience credit in terms of not needing to tell them when to laugh. I love that about the show. There's no laugh track.
But if you read Jane Austen you know that she had a wicked sense of humor. Not only was she funny but her early writing was very dark and had a gothic tone to it.
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Humor is the ability to see three sides to one coin.