The Crazies

A man is walking along the road, when he hears someone shouting "Twelve! Twelve!" over a fence.

As he walks closer to the fence, they start shouting "Thirteen! Thirteen!"

Curious, the man looks through a gap in the fence. Suddenly he's poked in the eye by a man on the other side, and as he lies there, clutching his head, the man hears "Fourteen! Fourteen!"