Story Device: Unable to Admit a Mistake

Sometimes, when you come up with ideas for stories, you might start out with just a character or perhaps a bit of action inspired by seeing something on the news. And sometimes, a quirky little idea may find its way to your writer's brain as a theme or device around which a story can be wound. Challenge to You, Writer: Write a story, scene, or anything else around the idea of a person who is unable to admit a mistake. What consequences ensue? What action flows from this one character's character flaw? Some Possible Examples: Two good friends have a falling-out based on one friend's misunderstanding. This friend has plotted revenge and just as it is about to destroy her old friend, she realizes her mistake. How can she stop the disaster about to happen? Will she ever restore the old friendship? A boss fires the wrong employee. A cop shoots an innocent kid. A husband believes his faithful wife is unfaithful. A teacher accuses an honest student of cheating. An elected official wrongly accuses another elected official of corruption. WHAT MIGHT RESULT IF ANY OF THESE CHARACTERS WERE UNABLE TO ADMIT THEIR MISTAKE?