Aesop

“ Why I have these fits of yawning I cannot tell: maybe they are sent as a punishment for my misdeeds; but, whatever the reason, the facts are that when I have yawned three times I become a ravening wolf and fly at men’s throats.” As he finished speaking he yawned a second time and howled again as before. The Innkeeper, believing every word he said, and terrified at the prospect of being confronted with a wolf, got up hastily and started to run indoors ”