I didn't change anything!

I didn't change anything! interj.  An aggrieved cry often
   heard as bugs manifest during a regression test.  The
   {canonical} reply to this assertion is "Then it works just the
   same as it did before, doesn't it?"  See also {one-line fix}.
   This is also heard from applications programmers trying to blame an
   obvious applications problem on an unrelated systems software
   change, for example a divide-by-0 fault after terminals were added
   to a network.  Usually, their statement is found to be false.  Upon
   close questioning, they will admit some major restructuring of the
   program that shouldn't have broken anything, in their opinion, but
   which actually {hosed} the code completely.