Coraline is incredibly disturbing. Mature themes, terrifying moments, and obese women completely naked save for pasties that look more like nipples than they have any right to in a PG-rated movie. The "Other" Mother character is incredibly scary, moreso than the Oogie Boogie man in Nightmare, and even gave one of the adults in my family (that is, over the age of 40) bad dreams.
With all that being said, it's still a film that everyone should see at some point in their lives. It all depends on what your kids have been exposed to already. If your son is under the age of 8, but has seen a lot of intense movies from the past decade because you've deemed them OK, then you're probably good with showing him the film. I'll be watching it with my 8-year-old sister, who's incredibly intelligent and pop-culture savvy for her age, so we'll see what happens there. But anyone seven or under, boy or girl, I'd recommend giving it a watch yourself first to determine whether or not you'd want to screen it for your child.
I respectfully disagree. :wink: