Disclaimer: I still don't own Harry Potter.
Book Five
Fireworks
Well done. Oh, well done, boys! I'll be paying a visit to your shop soon, never you fear.
You've done what nobody else could. United us. From Peeves (and you are the only students he's ever taken orders from!), to the professors, right down to some of the Slytherins.
And that, that is not the miracle you might think it is. I wish we had known about Dumbledore's Army.
I would have joined.
And, being cunning, would have figured out how to avoid getting caught.