Well, BlackBook.com is the only Web site that's said the film is a horror comedy. And it's worth noting that Eva Green wasn't the one that said that, it was the writer of the article. And it would be great if writers didn't embellish upon or interpret quotes on their own, but sadly, far too many do read things into quotes that weren't necessarily meant to be there. The writer could have simply assumed that the film will be a horror comedy based on Green's remark that it's funny. And as for that remark, as I mentioned before, there could be other ways of interpreting it other than the film being a full-on comedy. (Though if it is indeed a horror comedy, I suspect KLS is going to have a lot of explaining to do when she's confronted with a mob of angry fans who wonder how the hell she could think turning DS into a comedy was a marvelous idea.
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There is also one other possible explanation, though I don't know how much stock I put in it. I've read on a few other DS message boards where fans are speculating that several of the people connected to the film are deliberately passing along misinformation, possibly even at Tim Burton's request, so as to keep the real details of the script a secret. And that does sound a bit far fetched. However, it's not a practice that's completely unheard of because other TV/film producers have actually used that ploy. And given his penchant for intense secrecy, it's not something I would completely put past Burton. But as to whether or not he has actually been doing it, well, I'd probably come down more on the no than the yes side - but I suppose only time will tell...