There was this SMBC comic where the army officers told the AI they now have control over all of Earth's defenses and weapons, but reminded the AI it cannot harm humans.

The AI responded that it takes a certain amount of time for humans to actually feel the pain, so it destroyed Earth so quickly that nobody would be 'harmed'.

Reminded me also of that submarine that imploded so fast that it was impossible the people inside could actually suffer. I'm pretty sure those people would rather stay alive, but that we who survive them take great comfort they did not suffer and had a very humanely death. Whatever a humanely death may actually be...