"Let's try again," said Severus. "Potter, where would you look if I told you to find me a bezoar?"
"That's not in the textbook either," Harry said, "but in one Muggle book I read that a trichinobezoar is a mass of solidified hair found in a human stomach, and Muggles used to believe it would cure any poison -"
"Wrong," Severus said. "A bezoar is found in the stomach of a goat, it is not made of hair, and it will cure most poisons but not all."
"I didn't say it would, I said that was what I read in one Muggle book -"
"No one here is interested in your pathetic Muggle books. Final try. What is the difference, Potter, between monksblood and wolfsbane?"
That did it.
"You know," Harry said icily, "in one of my quite fascinating Muggle books, they describe a study in which people managed to make themselves look very smart by asking questions about random facts that only they knew. Apparently the onlookers only noticed that the askers knew and the answerers didn't, and failed to adjust for the unfairness of the underlying game. So, Professor, can you tell me how many electrons are in the outermost orbital of a carbon atom?"
==============================================================
"Let's try again," said Severus. "Potter, where would you look if I told you to find me a bezoar?"
"That's not in the textbook either," Harry said, "but in one Muggle book I read that a trichinobezoar is a mass of solidified hair found in a human stomach, and Muggles used to believe it would cure any poison -"
"Wrong," Severus said. "A bezoar is found in the stomach of a goat, it is not made of hair, and it will cure most poisons but not all."
"I didn't say it would, I said that was what I read in one Muggle book -"
"No one here is interested in your pathetic Muggle books. Final try. What is the difference, Potter, between monksblood and wolfsbane?"
That did it.
"You know," Harry said icily, "in one of my quite fascinating Muggle books, they describe a study in which people managed to make themselves look very smart by asking questions about random facts that only they knew. Apparently the onlookers only noticed that the askers knew and the answerers didn't, and failed to adjust for the unfairness of the underlying game. So, Professor, can you tell me how many electrons are in the outermost orbital of a carbon atom?"
(Of course Snape knew, but the point stands).