This guy is walking past a wooden fence. On the other side of the fence is an asylum.
The inmates are all screaming at the tops of their lungs, “Thirteen Thirteen THIRTEEN ”
The guy notices a small hole in the fence and his curiosity naturally gets the better of him. He takes a peek and a finger suddenly pops out and jabs him in the eye.
He yells in pain as the inmates start shouting, “Fourteen Fourteen FOURTEEN “