There was a shepherd boy who used to tell lies just for fun.
One day when he was tending the sheep, he started shouting. "Help! Help! There's a wolf!"
The farmers came running, and the boy just laughed at them.
He tricked the farmers again a few weeks later.
The next time, there really was a wolf.
"Help! Help! There's a wolf!" he cried. "It's the truth!"
But the farmers said, "We won't let that boy fool us a third time."
So the wolf attacked the flock and killed the sheep.
The boy thus learned his lesson the hard way.
Inspired by: Mille Fabulae et Una, a collection of Latin fables that I've edited, free to read online. I am not translating the Latin here; instead, I am just telling a 100-word version of the fable.
Notes: This is fable 76 in the book, which is Perry 210.