Harry Potter and the Stuck-up Drake
Part of the definition of Malfoy was "stuck-up". It came along granted in conversation, like the thing that is never mentioned outright because it's already so obvious that everyone just assumes it doesn't need to be mentioned. Malfoy had always been stuck-up, from the first chance encounter at Madam Malkin's to the last passing-by in the corridors. That stupid sneer was so permanently etched on his face that it hardly seemed plausible to even consider that he might have other feelings beside superior self-importance and condescending disgust. He was stubborn, relentless, infallible.
Therefore it was unnerving to see him cry.