I have an intricate Nutcracker music box in the shape of a faux Fabergé egg that was given to me as a gift. It sits on a book shelf, I haven't touched it in months, and no one's wound it in that time frame.
Tonight, as I was working on a series of graphics for a book, I was startled by the fact that this music box just went off by itself, playing the Nutcracker theme. Then it happened again a few minutes later.
The entire atmosphere felt a little like this: