around a corner, where the first thing they saw was Peeves the Poltergeist, who was floating upside down in midair and stuffing the nearest keyhole with chewing gum.

Peeves didn't look up until Professor Lupin was two feet away; ,hen he wiggled his curly-toed feet and broke into song.

"Loony, loopy Lupin," Peeves sang. "Loony, loopy Lupin, loony, loopy Lupin --"

Amelia let out a snort.

Rude and unmanageable as he almost always was, Peeves usually showed some respect toward the teachers. Everyone looked quickly at Professor Lupin to see how he would take this; to their surprise, he was still smiling.

"I'd take that gum out of the keyhole if I were you, Peeves," he said pleasantly. "Mr. Filch won't be able to get in to his brooms."

Filch was the Hogwarts caretaker, a bad-tempered, failed wizard who waged a constant war against the students and, indeed, Peeves. However, Peeves paid no attention to Professor Lupin's words, except to blow a loud wet raspberry.

Professor Lupin gave a small sigh and took out his wand.

"This is a useful little spell, he told the class over his shoulder. "Please watch closely."

He raised the wand to shoulder height, said, "Waddiwasi! "and pointed it at Peeves.

With the force of a bullet, the wad of chewing gum shot out of the keyhole and straight down Peeves's left nostril; he whirled upright and zoomed away, cursing.

"Cool, sir!" said Dean Thomas in amazement.

"That was bloody brilliant!" shouted Amelia, her voice putting on a thick British accent unlike it had in the past. She blushed. 

"Thank you, Dean, Amelia," said Professor Lupin, putting his wand away again. "Shall we proceed?"