Spooky two-sentence horror story

A Reddit thread called What is the best horror story you can come up with in two sentences produced this damned spooky entry by justAnotherMuffledVo:

I begin tucking him into bed and he tells me, "Daddy check for monsters under my bed." I look underneath for his amusement and see him, another him, under the bed, staring back at me quivering and whispering, "Daddy there's somebody on my bed."

(via Super Punch)

(Image: Goldilocks Nightmare, a Creative Commons Attribution (2.0) image from rockandrollfreak's photostream)