This is your copy of Advanced Potion-Making, is it, Potter?â€
“Yes,†said Harry, still breathing hard.
“You’re quite sure of that, are you, Potter?â€
“Yes,†said Harry, with a touch more defiance.
“This is the copy of Advanced Potion-Making that you purchased from Flourish and Blotts?â€
“Yes,†said Harry firmly.
“Then why,†asked Snape, “does it have the name ‘Roonil Wazlib’ written inside the front cover?â€
Harry’s heart missed a beat. “That’s my nickname,†he said.
— J.K. Rowling
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