A jewelry box in my bedroom which plays Lara's Theme when the bottom drawer is opened.
Last week it started playing in the middle of the night. I got up and found the bottom drawer open.
Okay, maybe the cats, maybe a vibration from the street.
So I put it back, drawer closed and against the TV so it couldn't open again.
Next day I came home from work to hear the box playing again. It hadn't been moved and the drawer was shut - but it was playing.
A bit creepy.