Do you remember me telling you we are practicing non-verbal spells, Potter?" "Yes," said Harry stiffly. "Yes, sir." "There's no need to call me "sir" Professor." The words had escaped him before he knew what he was saying.
J. K. RowlingBut you're dead,' said Harry. 'Oh, yes,' said Dumbledore matter-of-factly. 'Then... am I dead too?' 'Ah,' said Dumbledore, smiling still more broadly. 'That is the question, isn't it? On the whole, dear boy, I think not.
J. K. Rowling