Since everyone is sharing spooky stories today, I'll add mine.
In the dark of night, when Sam and I are downstairs and everything is silent, sometimes one of us goes to put a disc in the DVD player. So we push "open," and the tray opens, but before we can get the disc in . . .
THE TRAY CLOSES AGAIN!!!
Usually this happens two or three times. It'll snap your finger inside if you're not careful. And then, without warning, the tray will start working again . . . as if it never happened!!