"Transfiguration is some of the most complicated and dangerous magic you will learn at Hogwarts. Anyone messing around in my class will leave and not come back. You have been warned."
— Minerva McGonagall
"You leave those brooms where they are, or you'll be out of Hogwarts before you can say 'Quidditch.'"
— Madame Hooch
"You're knocking on trouble's door."
— Mrs. Wingo, Doug