Albus Dumbledore rounded on the child, who sat on the stool looking petrified (it was, after all, the famous Albus Dumbledore), and bellowed, “What … is your favourite colour?”

“Um …” said the child, “blue?”

“RAVENCLAW!” Dumbledore roared, and amid a smattering of bemused applause, Minerva McGonagall muttered, “There’s got to be a better way of doing this, Albus.”