A few years ago, I was at home with my family. My house was fairly small so noise travelled well throughout the structure. I can't remember the exact time but if my memory serves me correct, it was around 10pm. The sound system in my brothers room went full volume without anyone even being in the room. The music was at its loudest and obviously startled the whole family, before we ran into the room and switched it off.
This is where it gets strange. The same night after the sound system almost blew the speakers on its own. We later heard the water running in the kitchen sink. We went to investigate and one of the taps was on full flow. Again, it was very strange as one would physically have to turn the tap to open the valve. As cliche as this may sound, it was very cold when I went into the kitchen to investigate the kitchen event. The fact of the matter is that both of these events happened on the same night and definitely spooked the family a little.