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An incident answer needs your actual decisions, the evidence behind them and the effect on users. A wrong turn belongs in the story only if it happened.

The most revealing behavioral question there is, because the interesting part is what you did after losing. Most candidates answer a different question, the one where they were right all along.

A question that punishes both extremes. A trivial mistake reads as evasion, a catastrophic one told carelessly reads as reckless, and the interviewer is really asking what you do in the twenty minutes after you realise.