OK, here goes. I could probably produce a list of things that all y'all'd disagree with, though I'm pleased to see that routine neonatal circumcision = bad isn't among them. But I'll just go for the jugular:
Flush toilets are the greatest evil in the world.
Edit: OK, so why the downvote? Presumably not because you disagree.
You might get a better response if you actively claimed RNC isn't bad.
Also, if you provided some clarifying explanation for the toilet claim. "Greatest evil in the world" is pretty extreme - try modifying it downwards.
What do you believe that most people on this site don't?
I'm especially looking for things that you wouldn't even mention if someone wasn't explicitly asking for them. Stuff you're not even comfortable writing under your own name. Making a one-shot account here is very easy, go ahead and do that if you don't want to tarnish your image.
I think a big problem with a "community" dedicated to being less wrong is that it will make people more concerned about APPEARING less wrong. The biggest part of my intellectual journey so far has been the acquisition of new and startling knowledge, and that knowledge doesn't seem likely to turn up here in the conditions that currently exist.
So please, tell me the crazy things you're otherwise afraid to say. I want to know them, because they might be true.