Thirteen!
A man is walking by an insane asylum and hears all the residents chanting, "Thirteen! Thirteen!"
Quite curious about all this, he finds a hole in the fence, looks in and someone pokes him in the eye.
Everyone in the asylum starts chanting "Fourteen! Fourteen!"
中文：
一个人路过疯人院，听见里面的病人正在一起高喊，“十三！十三！”
这人感到很奇怪，碰巧发现栅栏上有一个洞，他上前朝里面看，这时突然有一个人从里面伸出手指戳中了他的眼睛。
于是疯人院里所有人开始一起高喊，“十四！十四！”