A Bald Head in the Doorway

As a kid I was lying alone in the bedroom watching cartoons on the TV, and the only other person home at the time was my grandma. So anyway, I'm watching TV and out of the corner of my eye I notice my dad peeking into the room. I turn my head toward the doorway, and instead of my dad there's a bald, very thin head peeking in, like a skull with nothing but skin stretched over it and crystal marbles stuck into the eye sockets. Well, I looked at that shit with a poker face back then, and then turned back to keep watching cartoons. Later I went out and asked my grandma if anyone had come by. She said no.
For some reason every time I remember this story, my asshole clenches up.