A building inspection team tests every door lock in a new skyscraper. Every lock turns smoothly; every door closes flush. The building opens without incident. Two weeks later, an unusually intense heatwave expands a structural joint no one thought to watch, subtly shifting an entire wing out of square. Overnight, dozens of doors stop latching. The locks were never defective. The surprise came from a part of the system no one realized depended on those locks.
This is a black swan bug. Following Nassim Taleb’s framing, “black swans” are unpredictable in advance, catastrophic in impact, and painfully obvious in retrospect.
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