So I lived in the same house until I was twelve. The entire time I lived in the house it was haunted. The earliest sign I remember is when my older sister and I were upstairs in our room talking and someone would slam our bedroom door open even though it was latched. We grew to call him Mr. Ghostly. (Keep in mind I was like four or five at the time.)
Every once in a while you could hear him walking up and down the stairs between the first and second floor. You could hear him sit on the couch and open drawers in the kitchen then head back upstairs. The day after Christmas my parents told us they were getting a divorce and it seemed like after that the activity from Mr. Ghostly occurred more often.
My dad had already moved out, but a couple days before my mom moved out I woke up to a shadow on my door. I know I wasn't dreaming which is what everyone kept telling me when I tried to tell them. My families are the only ones that believed me. Well the shadow on my door was like a tall man, I couldn't see much detail, but I could make out the body and face. When I sat up a bit in my bed I saw the head turn towards me and it was like he sat there and stared at me for just about a minute and then he turned around and left. After he left I heard the familiar footsteps down the stairs and through the living room.
The day we went to move out I went up to my room and told him he could go with us. (My mom got mad at me for that, but I was never threatened by him and I didn't think it would be the same in the new house.) Just a couple days ago I got on my laptop and apparently he made a video on my webcam while I wasn't there.
And now he goes back and forth with me between my dad's and mom's. It freaks my pets out at both houses though.