Once upon a time, there was a joke about a stupid child.

It is said that there is a fool in the village who shouts "thirteen, thirteen" to a well every day. A passerby was curious and asked the fool, "What are you shouting?" The fool ignored him and shouted, "Thirteen, thirteen". Passers-by went to see for themselves, and his head just reached the well. The fool kicked him down and shouted; Fourteen, fourteen.