MuggleNet Throwback: J.K. Rowling's official site reveals 'Half-Blood Prince' chapter titles

This week's throwback takes us back to October 31, 2004, when the mysterious door was opened on J.K. Rowling's official website. It revealed a new-found treasure for all Potter fans: several chapter titles for Harry Potter and the Half-Blood Prince.

You can revisit the locked door now, flip the time-turner back to the date (10/31/04) and reveal the hidden secrets all over again! Head on over to JKRowling.com and click on the eraser on Jo's desk. We will leave the rest up to you.

If you can't figure out the secret to the locked door, don't worry, we have the instructions for you right here; but try it yourself first.

Do you remember the discussions you had with other Potter fans as to what the chapter titles like 'Spinner's End,' and 'Felix Felicis' could possibly mean? Tell us your story of seeing the chapter titles for the first time in the comments below.