Argus Filch, the caretaker, was behaving so ferociously to any students who forgot to wipe their shoes that he terrified a pair of first-year girls into hysterics.
Come . . . come to me. . . . Let me rip you. . . . Let me tear you. . . . Let me kill you.
Control your emotions! Discipline your mind!
I can make things move without touching them. I can make animals do what I want them to do, without training them. I can make bad things happen to people who annoy me. I can make them hurt if I want to.
Yeah, Quirrell was a great teacher. There was just that minor drawback of him having Lord Voldemort sticking out of the back of his head!
You'd better get lost before my bones come back, Dobby, or I might strangle you. Dobby smiled weakly. Dobby is used to death threats, sir. Dobby gets them five times a day at home.