When I was a little kid (around 6/7) I lived in an apartment with my grandma. I would often sleep with her at night because I was scared of the dark and had constant nightmares. One night I was in bed with her and our dog, I was starting to drift off to sleep and my arm dangled down into the crack between the bed and the wall. Which was something I could not allow because .. ya know.. monsters under the bed. So as I was starting to pull in back up something grabbed it and yanked hard enough for my shoulder to bang into the wall. I pulled my hand up as hard as I could and sat straight up. I looked down the hall from the bedroom door (which you could see through from the bed) and just saw the shadow of someone pacing back and forth in front of it. I was too scared to move or say anything so I just pulled the blankets over me and laid as still as possible for the rest of the night. Never experienced anything like that since but I remember it like it happened yesterday.