Harry Potter and the Order of the Phoenix was the book that got us ready for the eventual war on Voldemort, it was when stuff started to get super real... but it was also the book where JK Rowling snuck in a little easter egg that a lot of fans missed. Because we were so distracted by the unpleasant evil that Dolores Umbridge was, we didn't realise the little detail about one of Voldemort's Horcruxes...
Remember when Harry and Ginny are exploring Sirius Black's ~muy~ creepy house?
“They found an unpleasant looking silver instrument, something like a many-legged pair of tweezers, which scuttles up Harry’s arm like a spider when he picked it up, and attempted to puncture his skin. Sirius seized it and smashed it with a heavy book entitled Nature’s Nobility: A Wizarding Genealogy. There was a musical box that emitted a faintly sinister, tinkling tune when wound, and they all found themselves becoming curiously weak and sleepy, until Ginny had the sense to slam the lid shut; a heavy locket that none of them could open; a number of ancient seals …”
A locket you say?! Hmm that's funny, Harry and Dumbledore found a Horcrux that was a big old locket in a cave in book six.... And what else did they find in that locket (besides a spell to raise the dead). A note!
The letter said: “To the Dark Lord: I know I will be dead long before you read this, but I want you to know that it was I who discovered your secret. I have stolen the real Horcrux and intend to destroy it as soon as I can. I face death in the hope that when you meet your match, you will be mortal once more.” —R.A.B.
We later find out that R.A.B. is Regulus Arcturus Black, brother to Sirius was one of few Death Eater's who tried to leave Voldemort's service. Probs because he found the Horcrux, knew what it was and planned to destroy it! More annoying though is the fact that it had been sitting in plain sight at Grimmauld Place before Harry went on a massive search to find them. Sigh.
Thank you JK for giving the gazillion of us who re-read the books every year more little details to discover!