Seriously! Those porcelain dolls are more than creepy. That wouldn't be a problem since there are many creepy things around and they don't have to have anything to do with the Dark Arts, but you will exactly know what I mean if you ever had to sleep in a room full of porcelain dolls.
They gather in groups and follow you with their eyes wherever you go and then when you sleep, they'll walk through the room, punch you in the face and when you wake up the next morning you'll have a black eye and several bruises. The dolls will sit there and countinue to stare at you.

This is quite obviously full of dark magic!