There was once a boy who's job was to call out wolf if he ever saw one to protect the sheep. Over time the boy grew bore of his job and wanted to entertain himself.
One day he decided to call wolf when there wasn't any wolf in sight. The village people heard him and started to gather up their sheep. Then they looked at the boy and he was laughing.They had figured ou that it was a joke.
He played this joke so often that the village people never believed him anymore. One day he saw a wolf so he called out wolf but no one came. The wolf ended up eating a lot of sheep and leaving. Even when liars tell the truth no one believes them.