One night I was coming home from a party at around 2am. As I was walking through the yard, I saw a shadow of a woman with long hair in my mom-in-law's bedroom window. I thought it was her so I didn't think anything of it at first.
The next morning I walked into her room to ask if she waited up for me to come home the night before. She told me she was asleep before 12. Then she asked me if I walked into her room when I got in because someone stood at the end of the bed saying "Mama". I don't know if that was a sign for us, but we were already planning to move out of that house weeks before.
Another experience I've had happened a couple weeks after the first incident. I was babysitting a two year old and a six month old. Like any two year old boy entering his terrible twos, Sam would run around the house screaming "I'm Spiderman" at the top of his lungs. I didn't think anything of it until he stood in front of a wall yelling "Noooo, I'm Spiderman! You Batman". Nobody was there. But that wasn't the worse part. What really creeped me out was when his six month old sister (who was in my arms at the time) stopped smiling at me and looked straight past me at the wall with her eyes wide as I had ever seen. Suddenly she started to scream and I couldn't get her to stop or to look at me. Sam began to scream "I'm Spiderman!" over and over again at the wall. Finally the baby stopped screaming abruptly and so did Sam.
Shortly after I heard the screen door slam and when I went to open the front door to see who or what it was, no one was there.