I'd rather not call this a "spook, spectre, or ghost" story, but this one is near and dear to my family's hearts.
Before my step-great grandmother (I talked about her in the Love Forum, a little.) passed away, she'd always talk about how she'd come down from Heaven to play her piano. Long story short, we now have a little set-up in our living room in remembrance to her, (she raised my step-mother, and was an amazing woman,) and inside is an ancient music-box that hasn't been played in well over fifty years. Sometimes the box will begin to chime its jingle and obviously none of us are doing it. Whenever it goes off and we're all downstairs just looking at it, it never feels scary, or "spooky," but it is very...surreal(?).