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Draco looked very worried. His head kept darting around, despite the fact that Draco had insisted on them going down into Harry's trunk, and using a true Quieting Charm and not just the sound-blurring barrier.

"What did you say to Father?" blurted Draco, the moment the Quieting Charm went up and the sounds of Platform 9 3/4 vanished.

"I... look, can you tell me what he said to you, before he dropped you off?" said Harry.

"That I should tell him right away if you seemed to be threatening me," said Draco. "That I should tell him right away if there was anything I was doing that could pose a threat to you! Father thinks you're dangerous, Harry, whatever you said to him today it scared him! It's not a good idea to scare Father!"

Oh, hell...

"What did you talk about?" demanded Draco.

Harry leaned back wearily in the small folding chair that sat at the bottom of his trunk's cavern. "You know, Draco, just as the fundamental question of rationality is 'What do I think I know and how do I think I know it?', there's also a cardinal sin, a way of thinking that's the opposite of that. Like the ancient Greek philosophers. They had no clue what was going on, so they'd go around saying things like 'All is water' or 'All is fire', and they never asked themselves, 'Wait a minute, even if everything is water, how could I possibly know that?' They didn't ask themselves if they had evidence which discriminated that possibility from all the other possibilities you could imagine, evidence they'd be very unlikely to encounter if the theory wasn't true -"

"Harry," Draco said, his voice strained, "What did you talk about with Father?"

"I don't know, actually," said Harry, "so it's very important that I not just make stuff up -"

Harry had never heard Draco shriek in horror in quite that high a pitch before.

Harry Potter and the Methods of Rationality, Chapter 38