The Phantom of the Opera by Gaston Leroux:
Raoul went home, greatly perturbed at all that he had heard.
“If I don’t save her from the hands of that humbug,” he said, aloud, as he went to bed, “she is lost. But I shall save her.”
He put out his lamp and felt a need to insult Erik in the dark. Thrice over, he shouted:
“Humbug! . . . Humbug! . . . Humbug!”