Defense Against the Dark Arts

Libby came in the classroom, and sat down beside Robin, hoping she wasn't late. "Hey."

"Hi, Lib." Robin said.
"...Nobody's here."

"... You're right. Wonder why."

The class soon began to file in with more students.
"Well, it took some time."

"Maybe we're just early - which is odd, I thought I was late."

"That, or the clocks are somehow behind."

"... maybe they are."

Class then started, and Umbridge entered the classroom.
She had a wide, toad-like smile, and pulled out her wand. she waved it at the board and words fluttered onto it. Apparently they had a pop-quiz on the defenses of some hex.
"I'll pass out the quiz-sheets, I expect a 10 out of 10 since we've been learning this for the past month."

Libby sighed, and eyerolled. She never liked pop-quizzes.

The papers shot around the classroom, and then Professor Umbridge said,
"When you are finished, turn the paper over and read your next lesson. We'll be starting on patronuses, and how to perform them. No, don't take your wands out, students!" As some people began to pull them out excitedly.
"We'll be reading from the book."

Libby glared at Umbridge, not even waiting until her back was turned. She then looked down at her quiz and started on it.

Umbridge simply smiled back.
"Begin,"

Robin clenched her teeth in frustration. School wasn't ever that fair, though, so...