One of the saddest scenes in the Harry Potter series happens quite quickly. In a montage showing Harry, Ron, and Hermione leaving their respective homes, we watch Hermione wipe her parents' memories using the Memory Charm and remove all traces of herself from their lives, making them believe that they never had a daughter. As fans know, there are differences between the Harry Potter books and films, and in the book, it's explained that she convinces her parents (played in this movie by Ian Kelly and Michelle Fairley) that their names are Wendell and Monica Wilkins — not Mr. and Mrs. Granger — and that they want to move to Australia.
This brave sacrifice protects Hermione's parents from torture by Death Eaters. But as Reddit user u/mundungousfletcher pointed out recently, it also means that Hermione never got a chance to finally share with her parents all the magic she learned at Hogwarts.
As Hermione herself would tell you, there are strict rules about underage witches and wizards using magic. (Some of the mistakes that are hard to ignore in the Harry Potter movies involve witches and wizards, including Hermione, causally breaking these rules.) Between the ages of 11 and 17, Hogwarts students are forbidden from using magic performed with a wand when they aren't at school. The reason children under 11 are exempt from punishment is because they tend to have less control over their powers — and they don't have wands — so they might be using magic accidentally. This means that Hermione waited through six years of being a magical genius only to miss out on finally being able to show her parents what she was capable of.
