A man walking past a sanitarium hears voices chanting "Twelve, twelve, twelve..." from behind the wooden privacy fence.

Curious, he finds a knothole in the fence, and sticks his eye up to the hole, trying to determine the reason for the chant.

Instantly he is poked in the eye, and as he backs away, hand over the mutilated eye, he hears the chant begin anew: "Thirteen, thirteen, thirteen..."