An elderly German man got pissed at his neighbors for playing the same music over and over again. They kept doing it at odd hours and any time of the day or night. Finally, he reported the neighbors to the local police. When the police came to investigate, they found the cause in the man's own home. It was one of those musical greeting cards, which was sitting on his windowsill. Apparently, the sporadic winds would jiggle it, and it would start to play.
I hate those cards, but, of course, ThePinkThing loves them.
H/T to The Washington Post