Related:

• chroedinbug /shroh'din-buhg/ n. [MIT: from the Schroedinger's Cat thought-experiment in quantum physics] A design or implementation bug in a program that doesn't manifest until someone reading source or using the program in an unusual way notices that it never should have worked
  at which point the program promptly stops working for everybody until fixed....
• Bohr bug: /bohr buhg/ [from quantum physics] n. A repeatable {bug}
  one that manifests reliably under a possibly unknown but well-defined set of conditions....
• heisenbug: /hi:'zen-buhg/ [from Heisenberg's Uncertainty Principle in quantum physics] n.
  A bug that disappears or alters its behavior when one attempts to probe or isolate it....
• Bohr bug /bohr buhg/ n. [from quantum physics] A repeatable bug
  one that manifests reliably under a possibly unknown but well-defined set of conditions....
• heisenbug /hi:'zen-buhg/ n. [from Heisenberg's Uncertainty Principle in quantum physics] A bug that disappears or alters its behavior when one attempts to probe or isolate it.
  (This usage is not even particularly fanciful...
• mandelbug: /man'del-buhg/ [from the Mandelbrot set] n.
  A bug whose underlying causes are so complex and obscure as to make its behavior appear chaotic or even non-deterministic....
• misbug: /mis-buhg/ [MIT] n. An unintended property of a program that turns out to be useful
  omething that should have been a {bug} but turns out to be a {feature}....
• misbug /mis-buhg/ n. [MIT; rare (like its referent)] An unintended property of a program that turns out to be useful
  something that should have been a bug but turns out to be a feature....
• mandelbug /man'del-buhg/ n. [from the Mandelbrot set] A bug whose underlying causes are so complex and obscure as to make its behavior appear chaotic or even non-deterministic.
  This term implies that the speaker thinks it is a Bohr bug, rather than a heisenbug....