When I was 16 my family and I lived in a house in Aloha, Oregon. It was a 2 story 3 bedroom house, not huge but not small. My mom and brother had their own rooms. My sister and I shared the master bedroom. In my brother's room there was a cupboard looking hole in the wall with a door that he put his bed against because we used to joke that there was ghosts in there (yes joke). My sister and my room was very big and had its own bathroom and walk in closet. At night everyone would be in bed and I had sleeping problems at the time, so I would lay awake for hours. We had an alarm clock about 5 feet from our beds on the opposite wall (the red face ones). Every once in a while the red light would go out for a quick second and appear again. I would play it off as an electrical problem but it kept happening. After a while It started looking more and more like a shadow (though I couldn't see an actual figure) passing by it. It happened a couple times a week. To the point where I would just not look at it.
One day (mid day) everyone was home including two of my friends and my brothers best friend. Everyone was down stairs about to have some hotdogs my mom had BBQ'd for us. All of a sudden we hear the radio turn on, full blast in my sister and my room. We all stopped dead in our tracks. Shortly after we heard a door slam shut. We were a little freaked out but the windows were open since it was a nice day and we thought maybe the window blew it shut. However my brother and his friend were already headed upstairs. By the time they got to the top of the stairs the dog was barking (very territorial dog) like there was someone in the house. However, they did not find anything strange upstairs besides the radio being on. They turned it off and we ALL left for the day a little freaked out. My mom found a new house about a week later.
I know that ghost stories are easy to debunk and I welcome it. I have another story or two as well, but I'll post that separately.