One scenario could be that Mario and Luigi swap Bowser's precious treasure with fake replicas. Bowser would be furious when he discovers the switch.
Maybe the Toads manage to make Bowser think his castle has been invaded by an even scarier monster. They use some clever illusions and sound effects to prank him. This would cause Bowser to go on a wild rampage, only to find out it was a joke in the end.
Mario and Luigi are the most likely. They are always looking for ways to outwit Bowser, and pranking him would be a fun way to get back at him for all his evil deeds.
In certain 'dumbledore gets pranked fanfiction', a popular prank is to make Dumbledore's office furniture float and move around chaotically. Imagine him trying to sit at his desk and the chair keeps scooting away or the desk starts doing a little dance. Also, there could be a prank where his glasses show false images, like seeing a dragon in the hallway when there's actually just a cat.
Well, in this fanfiction, Leo could be pranked by having his clothes swapped while he's in the shower. So he comes out thinking he's going to put on his normal outfit but instead gets something completely outlandish. Another possibility is that his friends set up a fake lottery win and then tell him it was all a joke.
One interesting aspect in such fanfiction could be when someone pranks Toriel by making her think that her favorite recipe has been completely changed. They might switch out ingredients when she's not looking. Toriel then tries to cook with the new 'ingredients' and gets really confused, creating a humorous situation.
A common prank is changing the labels on her tea jars. So when she goes to make her usual tea, she ends up with a completely different flavor. It's a simple yet effective prank that can lead to some really funny reactions from Toriel.
In 'naruto gets wishes fanfiction', one interesting scenario could be Naruto wishing for all his friends who died in the original story to be alive again. This would completely change the dynamics of the Naruto world, as characters like Jiraiya could be around to guide Naruto further. Another scenario might be Naruto wishing for an end to all the hatred in the shinobi world, leading to a new era of peace without the need for constant fighting.
One interesting scenario could be Naruto struggling to control the power of the curse mark at first. He might accidentally lash out with its power during training, causing some chaos in the village. Another could be that the curse mark has some unexpected side effects, like changing his appearance slightly or giving him strange dreams that hint at the origin of the mark.
Imagine a scenario where Sakura discovers she's pregnant soon after they get married. Naruto is over the moon but also super nervous. He starts reading every parenting book he can find in the village library. Meanwhile, Sakura is dealing with morning sickness and trying to keep up with her ninja duties. Their friends all rally around them, offering support and advice. Some of the older ninjas share their own parenting stories, which are both funny and useful. This kind of family - centered scenario can add a lot of depth and warmth to the fanfiction.
In some fanfictions, Harry might use his magic skills in a creative way to embarrass Umbridge. For example, he could make her signature pink outfits turn into ridiculous colors every time she tries to be authoritative. Another scenario could be that Harry reveals some of Umbridge's darkest secrets in front of the whole school, which would surely be a form of revenge as she values her reputation so much.
One interesting scenario could be Wolverine remembering his past relationships. He might suddenly recall an old love, like Jean Grey perhaps, and how they interacted before. This could lead to some complex emotional moments as he tries to reconcile his new self with the memories of his past feelings.