for fans of venerable antique software (Unix) and machines (the PDP 11/45-70):
memorable bugs certainly include the comma gone wrong in a FORTRAN program
which sent a satellite mistakenly out of orbit into the sun, or a medical X-ray machine
disaster here or there, but I'd like to point out an early Unix hardware/software combo bug,
whereby the "cognizant personnel" (Tom Ferrin of UCSF, take a bow!) solved a rather
abstract software difficulty via a razor blade cut to a CPU circuit board foil trace.