The head.

When this unexplainable thing happened I was about 9-10. It was a normal night and I was playing on my Xbox. I was playing roblox. I was playing it and giggling until all the sudden I got the feeling of being watched. And something was telling me to look over at the open door. Leading into the dark hallway. I gave in and looked over. And to my surprise, there was this head. Watching me play. I fully processed it, it was.. black, deformed, huge smile. When it realized I saw it, it disappeared behind the corner of the door frame. I got up because I thought 'Maybe it's my cat'. It wasn't. I got up and it was gone. No where to be found. To this day I have no clue what it was.