Thirteen, thirteen, thirteen!!

A young man was strolling down a street in south London. As he
passed a large building with a fence around it, he heard a group
of people chanting "Thirteen, thirteen, thirteen, thirteen" over
and over again.

Curious, he tried to see over the fence, but couldn't. Then he
spotted a knot in the wood, and 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, fourteen..."😃