I've posted there a lot in the past (nicely, and they liked me a lot). I know what they're like.
Appel to authority logical fallacy. You haven't explained why they shouldn't just link to a mirror of a shock site for a much more effective effect.
People who are that easily shocked may get upset at movies, period. It is notoriously difficult to tell the content of a movie from its name. And you just pointed out yourself that movie ratings in one country may mean nothing in another.
They may get shocked at movies but they will not expect to get shocked by encyopedia articles.