A guy is walking past a mental hospital when he hears some of the residents, on the grounds, chanting "Thirteen! Thirteen! Thirteen!"
There's a fence blocking his view so he has no idea why they are chanting "Thirteen!" and curiosity gets the better of him. He searches the fence and eventually finds a small hole at about head height.
As he puts his eye up to the hole, a stick jabs through it, poking him in the eye and leaving him staggering around in agony.
Through his pain he's dimly aware that the chanting has changed to "Fourteen! Fourteen! Fourteen!"
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