My legacy would be that you don't have to give up anything. You can be chic but have a sense of humor you can be sexy but comfortable you can be timeless but fresh.
Negative humor is forgotten immediately. It's the stuff that makes us feel better about our lives that lives long. Much more satisfying. Enter children's books.
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I mean yeah I'm sure that Python and the other things have paved the way for a greater understanding of the British sense of humor but I don't think it's all that different than the American sense of humor.