I didn't change anything!
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.