Heisenbug, der
Schwer diagnostizierbarer Software-Fehler, der nicht mehr oder in geaenderter Form auftritt, wenn man versucht, ihn mit Debugging-Methoden gezielt aufzuspueren.
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https://en.wikipedia.org/wiki/Heisenbug
Davon strikt zu unterscheiden sind folgende artverwandte Bugformen: Mandelbug, Schrödinbug, Hindenbug sowie das Higgs-Bugson.
Mein persönlicher Favorit ist natürlich der Schrödinbug.

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Wikipedia hat geschrieben:A bohrbug, by opposition, is a "good, solid bug". Like the deterministic Bohr atom model, they do not change their behavior and are relatively easily detected.
A mandelbug (named after Benoît Mandelbrot's fractal) is a bug whose causes are so complex it defies repair, or makes its behavior appear chaotic or even non-deterministic. The term also refers to a bug that exhibits fractal behavior by revealing more bugs (the deeper a developer goes into the code to fix it the more bugs they find).
A schrödinbug or schroedinbug (named after Erwin Schrödinger and his thought experiment) is a bug that manifests itself in running software after a programmer notices that the code should never have worked in the first place.
A hindenbug (named after the Hindenburg disaster) is a bug with catastrophic behavior.
A higgs-bugson (named for the Higgs boson particle) is a bug that is predicted to exist based upon other observed conditions (most commonly, vaguely related log entries and anecdotal user reports) but is difficult, if not impossible, to artificially reproduce in a development or test environment. The term may also refer to a bug that is obvious in the code (mathematically proven), but which cannot be seen in execution (yet difficult or impossible to actually find in existence).