I think one of the strengths of Moffat's episodes is that he takes normal, everyday things and makes them into frightening alien things, whereas other writers take aliens and try to make them evil... though some don't do too badly at it - remember the first of the two-parter episode with the Ood?
"Are you my mummy?", killer statues, shadows. There was a line in this episode that made me think of "Are you my mummy?", but I can't remember what it was... in fact, let's iPlayer it. I'll also take this chance to get out my paper and pen as this old head can't retain more than a few things at once.
