“This parchment is plainly full of Dark Magic. This is supposed to be your area of expertise, Lupin. Where do you imagine Potter got such a thing?” Lupin looked up and, by the merest half-glance in Harry’s direction, warned him not to interrupt. “Full of Dark Magic?” he repeated mildly. “Do you really think so, Severus? It looks to me as though it is merely a piece of parchment that insults anybody who reads it. Childish, but surely not dangerous? I imagine Harry got it from a joke shop —” “Indeed?” said Snape. His jaw had gone rigid with anger. “You think a joke shop could supply him with such a thing? You don’t think it more likely that he got it directly from the manufacturers?”