He's a brilliant wizard, he must study all day long! You go the classrooms. Not being able to understand what any of the signs are on the door, you boldly open the first door you come to. Inside is a doddering old wizard teaching magic to a bunch of kids, none of whom is Harry Potter! You turn to leave but he sees you!

"Ah, you must be the new student. Quickly now, how many ounces of rat do you need to transmorph a goldfish into a fountain pen?"

Everyone is staring at you, expecting an answer! What do you say?

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• If I knew that, I wouldn't need to learn anything, I'd already be a brilliant wizard like Harry Potter!