Once upon a time, there was a shepherd boy. He was set to guard sheep. He watched the sheep for several days. He got tired of that monotonous work.
One day he shouted 'wolf' as a joke. All the villagers hasten to his help. But they found no wolf.The boy laughed at them. The villagers got angry.
After a few days the boy shouted 'wolf!-wolf!' again. Villagers came there and found no wolf again. The boy laughed at villagers and The vilaagers got angry again.
After several days, One day A wolf really came there. The boy shouted 'Wolf!-Wolf!'. This time no one came there as they thought the boy is joking. The wolf killed several sheep.
Moral : Nobody trusts a liar.
Once a liar, always a liar.