Movie adaptations of books are notoriously less than satisfactory. And Harry Potter is no exception. While the eight films are certainly wonderful and magical and perfectly acceptable, a LOT of content never made it into the script. Which means that if you've only ever seen the films and never read the books... you missed out on a ton of side plots. Some of which were actually super important.
1. Ginny actually has a personality.

2. Harry was the one who funded Fred and George's joke business.

3. The Marauders' Map was created by Harry's dad, along with his friends Lupin, Sirius Black, and Peter Pettigrew.
4. Dumbledore sent the Dursleys a Howler when they were thinking of kicking Harry out after the Dementor incident.
5. Hermione's S.P.E.W. club.

6. Ron and Hermione were prefects.

7. Harry randomly finds — and dismisses — two Horcruxes before he even knows what they are.

8. Muggles can't see Hogwarts.

9. And electronic devices don't work there.
10. Muggle Studies is a subject that is taught at Hogwarts.
11. Snape can kinda read minds.

12. Fred and George were the ones who gave Malfoy the idea to smuggle Death Eaters into Hogwarts.

13. And in fact, the whole reason this cabinet was broken was because of Harry.
14. Percy fully turned his back on the whole Weasley family.

15. But his redemption came during the Battle of Hogwarts, literally seconds before Fred died.
16. Nearly Headless Nick had a Deathday party that was just full of ghosts.

17. Filch and Mrs. Figg are "Squibs" — people who are born into Wizarding families but don't have magical abilities.

18. Voldemort, aka Tom Riddle, is a half-blood.

19. Snape is also a half-blood.

20. Rita Skeeter is an Animagus, meaning she could turn into a beetle whenever she wanted.

21. When Fred and George left school in defiance of Umbridge, they turned a corridor of Hogwarts into a swamp.
22. The Sorting Hat sings a new song every year before the Sorting Ceremony.

23. When boys try to enter the girls' dormitory, the entry stairs turn into a slide and whoosh them back down.
24. Harry has a terrible date with Cho at a teashop in Hogsmeade that ends with her leaving in tears because Harry mentioned he was meeting Hermione later.

25. Trelawney is low-key an alcoholic.
26. Harry and Ginny broke up at the end of sixth book, just after Dumbledore's funeral.
27. Hagrid's motorbike once belonged to Sirius Black.

28. Neville could have been The Chosen One, instead of Harry.

29. Voldemort, when he was still Tom Riddle, desperately wanted to be the Defense Against The Dark Arts teacher at Hogwarts.
30. Aunt Petunia was in contact with Dumbledore when she was a kid.
31. Hermione and Ron's first kiss is actually in front of Harry.
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