It was beyond disappointing that her loud greeting went unnoticed. Hmph. She slouched a bit on her chair and waited for everyone to file in the class, she smiled here and there at those she knew but generally she kept silent waiting for the professor to start.

And soon enough, history of magic commenced. Passwords. She raised her hand and started, "They're usually there to protect something very valuable or very secretive." Like jewels or important files and papers. "And sometimes they're there to protect a place, like the case with the common rooms." And prefect's bathroom.