"What sort of magic do you teach, Professor Quirrell?"
"D-Defense Against the D-D-Dark Arts," muttered Professor Quirrell, as
though he'd rather not think about it. "N-not that you n-need it, eh,
P-P-Potter?" He laughed nervously. "You'll be g-getting all your
equipment, I suppose? I've g-got to p-pick up a new b-book on vampires,
m-myself." He looked terrified at the very thought.