Hmmm, I wouldn't say any forums are scary, but there are a few that I wouldn't want to post in.
I wouldn't want to post in the GD and LD, which really seem to be the same thing to me. There must be differences between them but I haven't spent enough time in either. I also don't want to post in the exchange, because I have no golds. I used to want to post in the ED a few years ago, but it somehow seems a lot worse now, so I wouldn't want to post there either.
As for home forums, I like the GCD, although I barely seem to post anything in here any more. I also spend quite a bit of time in the Lolita Fashion sub-forum, but again I hardly post, although that is more due to it being a slow moving forum. I also like posting in Heaven.