You know, I just remembered a picture in my grandmother's house. It was a photo of her parents on their wedding day, so my great-grandparents, who I never knew. It was a very large photo in a heavy frame and hung in the "kids' room" at grandma's house. I remember hearing it rattle at night but every time I'd flick my eyes at it the noise would stop. Every time. For years. I wasn't moving anything but my eyes because I could see it from my bed so it wasn't like the bed was rattling and stopped when I shifted my weight, and it was the only picture on the wall. Weird!