Related:

• Every program has at least one bug and can be shortened by at least one instruction -- from which
  by induction, one can deduce that every program can be reduced to one instruction which doesn't work....
• In every non-trivial program there is at least one bug.
• Every interesting program has at least one variable, one branch, and one loop.
  .. and at least one bug!...
• Every program has (at least) two purposes: the one for which it was written and another for which it wasn't.
• Every program has two purposes -- one for which it was written and another for which it wasn't.