Once upon a time there was a dim-witted wolf who saw a horse grazing in a field and decided to eat him.
When the horse saw him approaching he sensed the danger. So the horse thought of a plan. The horse said to the wolf, "You cannot eat me, I have a passport."
"What's a passport?" asked the wolf, puzzled.
"Come and stand behind me," said the horse, "I'll show you." The wolf was curious to know what a passport was.
The wolf went and stood behind the horse. He was wondering if perhaps the horse's tail was the passport when he received such a kick on his face that two teeth shot out of his mouth.
While he lay on the grass, dazed, the horse made good his escape.