Harry could use a transfiguration spell to turn Dumbledore's beard into a bunch of snakes. That would be quite a shock for Dumbledore when he looks in the mirror. Another way could be to magically make all of Dumbledore's papers in his office fly around and form funny shapes like animals or wizards doing silly dances.
In fanfiction, Harry could prank Dumbledore by creating a magical illusion that makes it look like Hogwarts is being invaded by a horde of pink elephants. Dumbledore would surely be caught off - guard and have to figure out what's going on. Harry could also use a potion to make Dumbledore's voice sound like a squeaky mouse whenever he tries to give a speech, which would be both funny and a bit embarrassing for Dumbledore.
Well, Harry might use a charm to make Dumbledore's glasses show false images. So when Dumbledore looks through them, he sees things like Hagrid wearing a ballerina tutu or McGonagall with a big clown nose. Or Harry could bewitch Dumbledore's pens to write only in silly rhymes instead of normal notes.
Harry might outsmart Dumbledore by having a deeper understanding of the Horcruxes. If he discovers something new about Horcruxes that Dumbledore missed, perhaps a hidden weakness or a way to detect them more easily. This could give him an upper hand, especially since the Horcruxes were such a crucial part of the battle against Voldemort.
One possible reason could be that Harry breaks school rules in the fanfiction. For example, if he ventures into the Forbidden Forest without permission. Dumbledore is strict about the safety of students and such disobedience might lead to punishment.
One way could be to use a Patronus. For example, if Ginny was pregnant, she could send out her horse Patronus to her friends, and the Patronus could speak the news. Another idea is to use a magical object like the Marauder's Map. The words 'A baby is on the way' could magically appear on the map when it's opened by the right people. You could also have a house - elf get involved. The house - elf could be dressed up in a little baby - themed outfit and carry a sign with the pregnancy announcement.
One way is to base the name on a specific location in the wizarding world. For instance, if your story takes place a lot in Diagon Alley, you could name it 'Diagon Alley Adventures: A Harry Potter Fanfic'.
Well, Harry might outsmart Dumbledore by using his unique understanding of the magical world in ways Dumbledore doesn't expect. For example, Harry has a more direct experience with some dark magic items due to his encounters with Voldemort. He could use this knowledge to make decisions that seem counter - intuitive to Dumbledore but are actually more effective in a particular situation.
One possible reason could be a misunderstanding. Maybe Harry overheard something that made him think Dumbledore was planning something against him that he didn't understand. For example, if he heard Dumbledore discussing a dangerous mission for him without his full knowledge.
Maybe Harry finds out that Dumbledore knew more about his family's past than he let on. For instance, if Dumbledore had information about some dark secrets in the Potter family but didn't tell Harry, it could make Harry furious and prompt him to yell. Also, if Dumbledore's actions led to the death or harm of someone Harry cared about, like Sirius, Harry would likely be very angry with him.
It could involve Dumbledore teaching Tom differently and shaping his character in unexpected ways. Maybe it leads to a completely new dynamic between them.
I'm not sure if there is a specific 'Harry Potter Dumbledore Stealing Fanfiction' out there. However, if there were, the plot could potentially involve Dumbledore stealing something important like a powerful magical artifact that he believes is necessary to protect Hogwarts or the wizarding world from a great evil, but his actions are misinterpreted by the characters in the fanfiction.
In some fanfictions, Harry discovers a long - forgotten magic charm that has the power to make a person's worst nightmares come true. He uses it on Umbridge, and she is so terrified by the nightmares that she runs away from Hogwarts. The charm could be something that is based on the person's deep - seated fears, and for Umbridge, it might be related to losing her power and being publicly shamed.