Luna Lovegood

"Why are you out of uniform, Miss?" asked Argus.

"Oh, hello, Mr Finch, said the girl in a girlish feminine voice.

"I'm done with my classes, and there's a dance this weekend for those of us who are 18 and..."

Argus zapped her.

"Why, what was that?" the girl asked.

"What is your name?"

"Luna Lovegood."

"Luna, since you are out of uniform on the school grounds, you must strip naked, or I will report you to Professor Flitwick, and you'll be expelled and forbidden from ever using magic."

"Oh dear! I'm sorry," said Luna. She started to take off her dress. "Do you have to watch?"

"Yes, I'm afraid I must to make sure you don't try to run or use any magic."