Thirteen, thirteen, thirteen

A man walks past a mental hospital when he hears a voice moaning on the other side of the wall. “Thirteen, thirteen, thirteen, thirteen….”

The man looks towards the mental hospital and sees a hole in the wall.  He walks over and peeps through the hole in the wall.  Suddenly a finger shoots through the hole an pokes him in the eye.

The moaning voice continued, “Fourteen, fourteen, fourteen….”