Related:

• Heuristics are bug ridden by definition. If they didn't have bugs, then they'd be algorithms.
• Beware of bugs in the above code; I have only proved it correct, not tried it. -- D. Knuth
• The Definition of an Upgrade: Take old bugs out, put new ones in.
• One hundred hairy bugs in the code, one hundred hairy bugs.
  ...Fix one bug, compile it again, 101 hairy bugs. Repeat until BUGS = 0...
• Quote #582 Greenspun's Tenth Rule of Programming
  any sufficiently complicated C or Fortran program contains an ad hoc informally-specified bug-ridden slow implementation of half of Common Lisp....
• What's the main difference between what biologists call a "bug" and what computer programmers call a "bug"?
  Biological bugs reproduce very easily....
• Mature software: code old enough that for every bug fixed, one or more new bugs are created.
  -- Karl Lehenbaue...