Part of what people love about the Harry Potter franchise is just how much stuff is in there. There are countless little "Easter Eggs" and references that people are still discovering to this day.
Take, for example, something that reddit user jabthejesusfreak noticed in Harry Potter and the Deathly Hallows.
It happens when Ron and Hermione are looking for a button to turn off the Whomping Willow, a massive tree outside of Hogwarts that pummels anything that gets close to it.
While that moment may not sound like much, it is actually very similar to what Ron said to Hermione six years ago, during the events of Harry Potter and the Sorcerer's Stone.
In that book, Ron and Hermione face another aboral foe called the Devil's Snare, an entangling root that gets tighter the more you fight back. Hermione suggests that they use fire to burn it away to which Ron responds, "Have you gone mad? Are you a witch or not?" In other words, Hermione waited six long years to turn this insult back on Ron.
The redditor who made this discovery explains why this excites him so much.
Other redditors are just as excited.
Most importantly though, it is inspiring people to do what they need to do.