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Real Life Quiddich could be cool. But they have got to get rid of the broomsticks. I suppose they would say that they need to have them because that's how it was in the book and having to hold onto a broom with one hand part of the time is part of the challenge. Don't care. Nix the brooms, then get some R&D guys going full on research mode on how to get a ball to fly around and bash people*, then maybe we'll have something.
* actually that part could be a little tricky. If you succeed, won't you have created something that could be used for all sorts of really bad sh*t? Like litte flying bombs for example? hmm