Cupboards

You know it's there. In those cupboards. Even though it's quiet, you know. You can just tell that something's there, waiting. Perhaps it's waiting for you to open the door. Perhaps, it's just waiting for the opportune moment. Maybe it's both. If you don't open the door, it might leave the cupboard when you're not looking. It'll change hiding places. The cupboard, the basement, your wardrobe, under your bed, around the corner. . .
Eventually, it will get you. And when it does. . . Let's just say it's not quick, and it's far from painless.
It enjoys killing.
Especially once you know it's there.