It's creepy because it looks human enough but doesn't move like a human. We pick up on the head, torso, arms, and legs and subconsciously expect it to move as a

It's creepy because it looks human enough but doesn't move like a human. We pick up on the head, torso, arms, and legs and subconsciously expect it to move as a human would but it does not- or at least in the teaser it didn't. Since it did something you didn't expect it could be dangerous so you should be careful.