Well, it could be that the wife discovers her partner has been unfaithful. So she decides to play a prank on him at a party. She might make him eat something really spicy that gives him a 'crampie' - like a stomach cramp. It's her way of getting back at him for his bad behavior in a rather mischievous way.
It could end with the husband realizing his mistakes and apologizing to the wife. After getting the 'crampie' from whatever she did, he understands that his actions have led to her taking such revenge.
Well, maybe Boruto's family or friends are hurt by a powerful enemy. So he decides to train hard and seek revenge. He might travel to different places to learn new jutsu and gather allies along the way.
It could be about Sheldon getting back at someone who wronged him in the series. Maybe it's Leonard who ate his last slice of pizza without permission, so Sheldon devises an elaborate plan to make Leonard's life a little chaotic for a while.
Well, it could be about Issei seeking revenge on those who wronged him in the past. Maybe someone bullied him or betrayed his trust, and now he's out for payback. He might use his unique skills or powers to get even.
Perhaps in a 'wife gets ruined story', she is the victim of a false rumor. In a small town, someone spreads a malicious lie about her having an affair. This rumor spreads like wildfire, and she loses her reputation. Her friends start to avoid her, and she even faces discrimination in her community. As a result, her social life and mental well - being are 'ruined'.
Maybe Harry uses magic to make their house a mess. He could turn Dudley's room into a pigsty or make Aunt Petunia's precious china float and then smash. It's his way of getting back at all the years of mistreatment.
She might get revenge because she felt the Order made a decision that put her or her friends in danger. For example, if they sent Harry on a dangerous mission without proper support, Hermione could plan some elaborate scheme to teach them a lesson. Maybe she'd use her intelligence to expose some of their secrets or weaknesses.
Well, it could be that Rumple discovers some past wrong Dumbledore did to him or his kind. Maybe Dumbledore once meddled in Rumple's magical affairs and now Rumple wants to make him pay. He could start by using his unique magic to create chaos in Hogwarts, like making the staircases go haywire or the portraits misbehave.
In such a fanfic, the plot might involve Naruto finally realizing the unjust treatment he received from the villagers in his past. He could start by using his powerful ninja skills, which he has honed over the years. Maybe he begins with small acts of disruption, like causing minor chaos during village festivals. Then, as his revenge plan unfolds, he might target the village's infrastructure, such as disabling the security systems. However, this would likely be a complex story as Naruto also has friends in the village who would try to stop him and make him see reason.
Maybe Ron accidentally ruins Hermione's important experiment in the wizarding lab. In the fanfiction, Hermione could get revenge by getting all their mutual friends to side with her in an argument. She could present all the facts about how Ron's carelessness has cost her time and effort, making Ron feel isolated and guilty.