This episode was SO much fun. You can watch it over and over, trying to work it out, and revelling in Billie's dalliance.
I don't find The Weeping Angels so much hide-behind-the-couch scary as suspenseful, with the capability to make you jump out of your skin.
There is a stretch of road near my house where there are garden statues in view for a minute or two, and I make sure never to blink, just to keep the memory of this episode fresh and alive in my mind. Actually, I think it's time I watched it again.