When my mom and aunt were children in the 1950s, my aunt was taking piano lessons and learning to play a particular song. At that time, both parents were working so my mom and aunt were alone for a few hours after school. One day, when my mom and aunt got home from school, they had just opened the door to the house when my aunt freaked out and started crying.
She claimed to hear the song she was learning being played on the piano in the, as of yet, empty house. My mom didn't hear it, but told my aunt that maybe she was hearing it because she was anticipating playing it.
My grandfather died of a heart attack in 1984 when I was six years old. My mom told me that a few days after he died, my grandmother received a phone call that was just static on the other end. We think it was my grandfather.
A few years ago in 2003, my mom was at home alone (in our present house) when she said a glass in one of the cupboards spontaneously exploded, sending glass shards flying all over the place. It was true because we were finding shards all over the place even a few weeks later.
My mom also has a violin that she plays and a couple of times, I've heard it play a note while it's shut up in its case. My dad says he has also heard it.
One time, I was home alone when I heard clunking and scratching sounds coming from our basement. No, I did NOT go down to investigate!