"Parvati," Lavender said seriously, shutting her History of Magic textbook with a no-nonsense thump and placing it on her bedside table, "this has got to stop."

Parvati frowned, pushing dark hair behind one ear. "What do you mean?"

"You know what I mean," Lavender retorted. "Ever since that DADA class, you've been acting absolutely dotty."

Parvati looked offended.

"If you're referring to the boggart," she said primly, "all I have to say is there's nothing wrong with having a sense of humor."

"It's not normal, Parvati, and you know it!" Lavender insisted. "What was funny about Harry plummeting hundreds of feet through the air and nearly dying?"

Parvati giggled at the memory. Lavender gestured accusingly.

"You see?" she said. "You're so ... so morbid! When the Fat Lady got attacked by Sirius Black, you couldn't stop laughing until Percy Weasley slapped you!"

Parvati wiped tears of mirth from her eyes, continuing to giggle.

"There, you're at it again! This is even worse than last year-"

"Ooh, last year!" Parvati interrupted with a howl of laughter.

"When people almost DIED!" Lavender reminded her, picking up her book and slamming it down on the table for emphasis.

"I know! I know!"

"But it's not FUNNY!"

"But ... it is!" Parvati shrieked. "It really is!"

"Can't you see?" Lavender cried. "You're not right in the head, Parvati! I don't think I'm going to speak to you until you straighten yourself out!"

Parvati wasn't listening. She had collapsed on her bed in paroxysms of helpless laughter. Lavender sighed in disgust and pulled the bed-curtains closed. As far as she was concerned, the summer holidays could not possibly come soon enough.