"The charm that repels a boggart is simple, yet it requires force of mind. You see, the thing that really finishes a boggart is laughter. What you need to do is force it to assume a shape that you find amusing."

"But I don't laugh at anything," said Amelia dully. 

"We will practice the charm without wands first. After me, please ... Riddikulus!"

"Riddikulus!" said the class together.

"Good," said Professor Lupin. "Very good. But that was the easy part, I'm afraid. You see, the word alone is not enough. And this is where you come in, Neville."

The wardrobe shook again, though not as much as Neville, who walked forward as though he were heading for the gallows.

"Right, Neville," said Professor Lupin. "First things first: what would you say is the thing that frightens you most in the world?"

Neville's lips moved, but no noise came out.

"Didn't catch that, Neville, sorry," said Professor Lupin cheerfully.

Neville looked around rather wildly, as though begging someone to help him, then said, in barely more than a whisper, "Professor Snape."

Amelia nodded.

Nearly everyone laughed. Even Neville grinned apologetically. Professor Lupin, however, looked thoughtful.

"Professor Snape... hmmm... Neville, I believe you live with your grandmother?"

"Er -- yes," said Neville nervously. "But -- I don't want the boggart to turn into her either."

"No, no, you misunderstand me," said Professor Lupin, now smiling. "I wonder, could you tell us what sort of clothes your grandmother usually wears?"