I can only recall one particular experience at an old house that I used to live in. I had a bunk bed with an open space underneath, where you could sit,your back against one of the ends of the lower half of the bed, kind of like a wall. I remember sitting back against the edge of it, watching tv. I tried to sit up and I felt something tugging at the back of my head. I tried to pull myself away and it bashed my head against the side of it a couple times. Other family members saw all kinds of strange things at this house, like random objects moving and things like that.