Boy Who Cried Wolf

Intro
The "Boy Who Cried Wolf" plot is when someone lies for their own advantage and has those who they lie to believe them at first. But the more they lie, the less the people around them believe their fibs. Eventually, what they lie about actually happens and when the liar tells the people about it again, they just ever so happen to stop believing them with perfect timing and the liar gets what they deserve. In the end, the liar learn that lying isn't good and vows to never lie to exploit others again.

Plot Sample
Since the Boy Who Cried Wolf plot is based off a real story, we can just give you that story.

A shepherd boi who is watching over his flock of sheep decides that it'd be fun to prank his village's people into believing a wolf is attacking his sheep, so he calls out "Wolf, wolf!" to get their attention. The people hurry to the boy and check in on him, only to have the boy admit that there wasn't really a wolf. The villagers return home and leave the boy to tend to his flock. The shepherd calls out "Wolf!" once again and the villagers rush over to him again. After being told there still isn't a wolf, the villagers get tired of the boy's pranks and head home again, this time for good. Later, a wolf really does attack the sheep, but when the boy calls out "Wolf, wolf! HOLY SHIT THERE'S A FUCKING WOLF EATING MY SHEEP!!!!!!!!!!!!!!!!1", no one comes to his aid. After the wolf's attack, the sheep have all been devoured. The boy is left to regret ever pranking his village people before (in some version of the story) also being eaten by the wolf.