I had a nightmare about that sort of thing once - I was in a sculptor's workshop, and he was showing me around. Laid out on a table was a just-completed sculpture, that of a woman lying on her back. Now, the sculptor left for some reason, and I immediately knew - I KNEW - that the moment I took my eyes off that sculpture, she would come to life and attack me. And in the way of dreams, I couldn't keep my eyes on her - I tried as hard as I could, but eventually I turned my head for a second, and the woman woke up and lunged at me, screaming and clutching for my throat... and then I woke up. Damn freaky dream.