"One by one we come to life,
Then side-by-side we wait
While our company swells in numbers
(Some come early, some come late);
And some of us may bore you,
And some of us enthral,
But you cannot choose between us
You must take us one and all.
We'll be bound together tightly
For we're naught if we break free.
If you'd like some clues about us
Simply answer: WHO ARE WE?"

- A clue from J.K. Rowling's official site, on which she announced three chapter titles from Harry Potter 6, Harry Potter and the Half-Blood Prince:

Chapter 2 Spinners End
Chapter 6 Draco's Detour
Chapter 14 Felix Felicis

'J.K. releases three chapter names from Harry Potter' by Dave Haber, with info thanks to Felicia Rickman and other Wizard News readers. Wizard News, 31 October 2004