A full list of my SCP articles can be found here.
"Nightstalker"
Basically, this SCP would, at first glance, appear human. However, it would never talk or otherwise express itself, and would behave extremely withdrawn and enigmatic. When exposed to sufficient darkness, it would manifest its creepiness: its skin would split open along the back, and it would "shed" its human form and become a leaner, longer-limbed creature with a predatory disposition. It has an unhingeable jaw, like a snake, and very sharp teeth, as well as long claws. Basically, it's a nocturnal, human-hunting predator.
So, what do you think? Be honest; I don't want this one to end up like SCP-1050.