The Ass in the Lion's Skin
The story concerns an ass that puts on a lion's skin, and amuses himself by terrifying all the foolish animals. At last coming upon a fox, he tries to frighten him also, but the fox no sooner hears the sound of his voice than he exclaims, "I might possibly have been frightened myself, if I had not heard your bray." The moral of the story is often quoted as, clothes may disguise a fool, but his words will give him away.