I sometimes thought of asking her if she would let me sit at the big table with the rest of them just once, I would prove to her how civilized I could be; after all, I ate at home every day with no major mishaps.
There are no more uses of "mishap" in the book.
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We tripped while roller skating, but survived to laugh at the mishap.
We’re dealing with your mind, and the slightest mishap in what you’re thinking or interpreting or perceiving can render the resultant findings worthless."