Harry Potter and the Methods of Rationality

And this horrible, horrible humming is impossible to ignore. It is similar to a known lullaby, but it departs from that pattern unpredictably. It sets up expectations and then violates them, never in any constant pattern that would permit the humming to fade into the background. The listener's brain cannot prevent itself from expecting the anti-musical phrases to complete, nor prevent itself from noticing the surprises.

The only possible explanation for how this mode of humming came to exist is that it was deliberately designed by some unspeakably cruel genius who woke up one day, feeling bored with ordinary torture, who decided to handicap himself and find out whether he could break someone's sanity just by humming at them.

The Auror has been listening to this unimaginably dreadful humming for four hours, while being stared at by a huge, cold, lethal presence that feels equally horrible whether he looks at it directly or lets it hover at the corner of his vision -

The humming stopped.

There was a long wait. Time enough for false hope to rise, and be squashed down by the memory of previous disappointments. And then, as the interval lengthened, and lengthened, that hope rose again unstoppably -

The humming began once more.

The Auror cracked.

From his belt, the Auror took a mirror, tapped it once, and then said, "This is Junior Auror Arjun Altunay, I'm calling in code RJ-L20 on cell three."

"Code RJ-L20?" the mirror said in surprised tones. There was a sound of pages being flipped, then, "You want to be relieved because a prisoner is attempting psychological warfare and succeeding?"

(Amelia Bones really is quite intelligent.)

"What'd the prisoner say to you?" said the mirror.

(This question is not part of procedure RJ-L20, but unfortunately Amelia Bones has failed to include an explicit instruction that the commanding officer should not ask.)

"He's -" said the Auror, and glanced back at the cell. The Defense Professor was now leaning in back in his chair, looking quite relaxed. "He was staring at me! And humming! "

There was a pause.

The mirror spoke again. "And you're calling in an RJ-L20 over that? You're sure you're not just trying to get out of watching him?"

(Amelia Bones is surrounded by idiots.)

"You don't understand!" yelled Auror Altunay. "It's really awful humming!"

The mirror transmitted a sound of muffled laughter in the background, sounding like it was coming from more than one person. Then speech again. "Mr. Altunay, if you don't want to be busted to Junior Auror Second Class, I suggest you buckle down and get back to work -"

"Strike that," a crisp voice said, sounding slightly remote due to its distance from the mirror.

(Which is why Amelia Bones often sits in on a coordination center of the D.M.L.E. while doing her Ministry- required paperwork.)

"Auror Altunay," said the crisp voice, seeming to approach closer to the mirror, "you will be relieved shortly. Auror Ben Gutierrez, the procedure for RJ-L20 does not say that you ask why. It says that you relieve the Auror who calls it in. If I find that Aurors seem to be abusing it, I will modify the procedure to prevent its abuse -" The mirror cut off abruptly.

The Auror turned back to look triumphantly at where the current Defense Professor of Hogwarts was leaning back in his cushioned chair.

That man then spoke the first words that had left his lips since he entered the cell.

"Goodbye, Mr. Altunay," said the Defense Professor.

A few minutes later, the door to the detention cell opened, and in walked a grey-haired woman, dressed in the crimson-tinged robes of an Auror without any sign of rank or other ornamentation, carrying a black leather folder under her left arm. "You're relieved," the old woman said abruptly.

There was a brief delay while Auror Altunay tried to explain what had been happening. This was cut short by a nod and a stark, simple finger pointing out the door.

"Good evening, Madam Director," said the Defense Professor.

Amelia Bones did not acknowledge this statement, but sat down abruptly in the vacated chair. The old witch opened the black folder and her gaze moved down to the parchments therein. "Possible hints to the identity of the current Hogwarts Defense Professor, as compiled by Auror Robards." The title parchment was turned, flipped aside. "The Defense Professor said that he was Sorted into Slytherin. Claimed that his family was killed by Voldemort. Said he had studied at a martial arts center in Muggle Asia which was destroyed by Voldemort. A request filed with the Department of International Magical Cooperation identifies this incident as the Oni Affair of 1969." Another parchment was flipped aside. "It also seems this Defense Professor gave a most stirring speech to his students, just before last Yule, castigating the previous generation for their disunity against the Death Eaters." The old witch looked up from the leather folder. "Madam Longbottom was rather taken with it, and insisted that I read the entire thing. The argument struck me as familiar, though I could not place it at the time. But then, of course, I had thought you dead."

The chief law enforcement officer of Magical Britain was now gazing sharply at the current Defense Professor of Hogwarts, across the pane of spell-reinforced glass separating them. The man in the cell returned the gaze equably, without apparent alarm.

"I shall not name any names," said the old witch. "But I shall tell a story, and see if it sounds familiar." Amelia Bones looked back down, turning to the next parchment. "Born 1927, entered Hogwarts in 1938, sorted into Slytherin, graduated 1945. Went on a graduation tour abroad and disappeared while visiting Albania. Presumed