Bathroom Trouble

I was taking a bath one time a few years ago at this house where I used to live at. My family and I think it's haunted and after this experience I am pretty sure it is. Well anyway, I was busily taking a bath when all of a sudden the light turned off. I got scared and let out a yelp because I'm afraid of the dark. Someone must have heard me because pretty soon my family came inside. "Who turned off the light?" I asked. "Uh, no one?" my sister replied, "we were all outside and then we heard you yell." We then checked the light switch and it was flipped down. No one was inside at the time so who could it have been? Creepy.