A liar shepherd story: There was a shepherd boy. He used to graze a flock of sheep near a forest. It was not far from his village. One day, he wanted to make fun with the villagers. So, he shouted, “Tiger! Tiger! Help! Help!” The villagers heard his cry and ran to help him. When they came near him, they found no tiger there and the boy laughed at them. The villagers were fooled by the cunning boy and hence, they went away.
After a few days he made the same fun and the villagers came again to help him but found no tiger there. One day, a tiger really came and it attacked the flock of sheep. The boy somehow climbed up a tree and shouted for help. The villagers heard him but they thought that he was kidding again and so, no one came to help him. The tiger killed one of his sheep and took it away. The boy felt sorry for his silly joke. From then, he promised not to tell a lie and befool people again.
You can also see Another version of the story here- A liar cowboy story / nobody believes a liar story