1984 by George Orwell:
Winston had finished his bread and cheese. He turned a little sideways in his chair to drink his mug of coffee. At the table on his left the man with the strident voice was still talking remorselessly away. A young woman who was perhaps his secretary, and who was sitting with her back to Winston, was listening to him and seemed to be eagerly agreeing with everything that he said. From time to time Winston caught some such remark as “I think you’re so right, I do so agree with you,” uttered in a youthful and rather silly feminine voice. But the other voice never stopped for an instant, even when the girl was speaking. Winston knew the man by sight, though he knew no more about him than that he held some important post in the Fiction Department. He was a man of about thirty, with a muscular throat and a large, mobile mouth. His head was thrown back a little, and because of the angle at which he was sitting, his spectacles caught the light and presented to Winston two blank discs instead of eyes. What was slightly horrible, was that from the stream of sound that poured out of his mouth, it was almost impossible to distinguish a single word. Just once Winston caught a phrase—“ complete and final elimination of Goldsteinism”—jerked out very rapidly and, as it seemed, all in one piece, like a line of type cast solid. For the rest it was just a noise, a quack-quack-quacking. And yet, though you could not actually hear what the man was saying, you could not be in any doubt about its general nature. He might be denouncing Goldstein and demanding sterner measures against thought-criminals and saboteurs, he might be fulminating against the atrocities of the Eurasian army, he might be praising Big Brother or the heroes on the Malabar front—it made no difference. Whatever it was, you could be certain that every word of it was pure orthodoxy, pure Ingsoc. As he watched the eyeless face with the jaw moving rapidly up and down, Winston had a curious feeling that this was not a real human being but some kind of dummy. It was not the man’s brain that was speaking; it was his larynx. The stuff that was coming out of him consisted of words, but it was not speech in the true sense: it was a noise uttered in unconsciousness, like the quacking of a duck.