http://www.spout.com/films/Terminator_Film_Series/222649/default.aspx
http://www.spout.com/films/Back_to_the_Future/2146/default.aspx

Uncle MythMan says ...

Marty McFly–in the beginning of the first Back to the Future–overloaded Doc Brown's speakers. When Doc Brown finally got around to repairing the speakers, he ignited the machines' desire to conquer 'adversity' ('too darn loud'-ness.

Doc Brown's instructions to the speakers' computer were something like 'to not be too darn loud.' That was the exact specifiation given: 'too darn loud.'

Since he Doc Brown didn't have time to tell the machines how loud 'too darn loud' was (funny how there's never enough time for one who takes power over the space-time continuum), the machines felt it most-expedient to stay silent—terminating-any humans who might make them 'too darn loud,' -any humans who might hear the 'too darn loud'-ness and allow it to continue and -any humans who might know what 'too darn loud'-ness sounds like.

That last termination-order shows the difference between machines and some humans: the ability to trust people to make the right decision.

(Here I could add a few snarky links to a few 'Oklahoma City'-humans who don't trust other people to make the right decision; but–for now–I'll leave them and trust-that they won't hurt people too unforgivably or -that they'll lead the world joyfully into the Lake of Fire ... whatev.)

The humans inherently know there is a "suitably loud" and a 'too darn loud', know that the line between the two is ever-changing and -objective but -very definite and understand that 'too darn loud' is not defined by a hard-&-fast decibel-mark.

The machines–on the other hand–cannot universally acknowledge the many factors to the 'too darn loud'-set of equations ...

I'm sure many machines can compute such a set, but I'm equally sure-that the sets they produce will never be 'universal' and -that none of the machines would trust another machine to hold the the equations they give it as 'greater than' the equations it had at creation....

So the machines are doomed to efficiency ... doomed to seek the termination of humanity as the only method of insuring that they never make things 'too darn loud.'