"Thanks." She smiled, a little sheepish. "I read about it in a book about a haunted hotel. The main character is this writer who goes up there with his wife and son to take care of it in the winter, when no one's there, and he goes kind of ... crazy. Okay, a lot of crazy. But at one point, he has this nightmare where the topiaries come to life and chase him, and I thought: what if I could make it real?"