A careful examination of her cheque-book, and of the unpaid bills in her desk, showed that, when the latter had been settled, she would have barely enough to live on for the next three or four months; and even after that, if she were to continue her present way of living, without earning any additional money, all incidental expenses must be reduced to the vanishing point.
There are no more uses of "incidental" in the book.
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Promise me—incidental to the issue—Anglo-Saxon—dirty word—Childe Roland.
Harper Lee -- Go Set a Watchman
Many of the professors used the Socratic method—direct, repetitive, and adversarial questioning—which had the incidental effect of humiliating unprepared students.