A young man was strolling down a street.

A young man was strolling down a street.
As he passed a large building with a fence around it, he heard a group of people chanting "Thirteen, thirteen, thirteen" over and over again.
Curious, he tried to see over the fence, but couldn't.
Then he spotted a hole in the wood.
He put his eye to the hole.
He just managed to spy some old people sitting in deckchairs chanting, before a finger came out of nowhere and poked him in the eye.
As he staggered back, the old people started chanting, "Fourteen, fourteen, fourteen..."