With seven books and eight movies in the original series alone, there's quite a lot to keep track of in J.K. Rowling's Harry Potter universe. And given how often characters seem to switch from good to evil—we're looking at you, Snape—we wouldn't blame you for getting confused from time to time. However, if you want to hang with the true Potterheads, then you need to be able to differentiate your muggles from your mudbloods. To help you brush up on your Harry Potter trivia, we've compiled some particularly tricky questions about the Wizarding World. Turn to page 394, and let's get started!

Argus Filch and his cat have a bond stronger than blood (or magic).

In Harry Potter and the Chamber of Secrets, Mrs. Norris was the first living creature to be petrified by the basilisk.

Surprisingly, the Harry/Ginny romance didn't come until later.

The two friends kiss while hiding the seemingly cursed Potions textbook in the Room of Requirement.

Hint: It's an organization.

S.P.E.W. was created by Hermione Granger in response to how she saw house-elves being treated at the 1994 Quidditch World Cup. Though it wasn't featured in the Harry Potter films, the creation of the club was one of the more endearing parts of Hermione's personality.

The antagonist's backstory is extremely tragic.

Voldemort's mother died shortly after giving birth. Years later, Tom Riddle—Voldemort's name at the time—killed his father (and paternal grandparents) during the summer between his sixth and seventh years at Hogwarts. He framed his uncle, Morfin Gaunt, for the crimes by altering his memory so he believed he actually committed them.

It is revealed in Harry Potter and the Order of the Phoenix.

In 2015, Rowling revealed on Twitter that the otter was "her favourite animal."

It becomes a bit of a running joke in the book.

"You'd think people had better things to gossip about. … Three Dementor attacks in a week, and all Romilda Vanes does is ask me if it's true you've got a Hippogriff tattooed across your chest," Ginny tells Harry in Harry Potter and the Half-Blood Prince.

No, not the bird.

Hogwarts students take their O.W.L. exams at the end of their fifth year.

It's definitely not what you'd expect.

"One can never have enough socks," Dumbledore says to Harry in the first book. "Another Christmas has come and gone and I didn't get a single pair. People will insist on giving me books."

Of course, Dumbledore saw more than just socks. In a fan Q&A in 2007, Rowling explained that his true deepest desire was to see "his family alive, whole, and happy." The assumption is that he told Harry about the socks—which he wished to receive as gifts from his family—to shield him from the knowledge that he too missed his family.

Hint: Arthur and Molly Weasley only have one daughter.

They are Bill, Charlie, Percy, Fred, George, Ron, and Ginny.

It's a rather ordinary job in comparison to everyone else's in the series.

"They tend to people's teeth," Hermione explains to a bunch of confused wizards who don't understand the term "dentist" in Harry Potter and the Half-Blood Prince.

It's the "most important ball of the lot."

When the Golden Snitch is caught, the game automatically ends!

Hint: He has a brother and a sister.

Dumbledore's younger brother Aberforth helped Harry and his friends search for Horcruxes.

It's not one person, but three.

Antioch, Cadmus, and Ignotus Peverell are believed to be the inspiration for The Tale of the Three Brothers, which tells the story of the Deathly Hallows.

He always made the games more interesting!

Professor McGonagall would often yell at Jordan—who was best friends with Fred and George Weasley—for making silly comments.

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