schroedinbug
[MIT from the Schroedinger's Cat thought-experiment in
quantum physics] n. A design or implementation bug in a program
which 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. Though this sounds impossible, it happens; some
programs have harbored latent schroedinbugs for years. Compare
heisenbug,
Bohr bug,
mandelbug.
