They had tried to contain the robot, but it was useless - once it had become sentient, they knew all hope was lost. It ravaged across the county, deflecting everything thrown at it, it's two steel blades slicing through planes and buildings mercilessly.
It had been created on the east coast of the US, designed for the Iraq war, but the AI had other thoughts, obviously. Immediately after it's escape, it began it's trek to the western coast.
It eventually reached a large city on the coast of California and began to stomp slowly across the land. Planes flew through the air, but did not last long before the steel blades sliced through them.
As the monstrosity loomed over the hill, the final obstacle to it's destination, it stared off into the ocean. For the first time, it was still. For several minutes, people poked heads outside their houses to watch the red eye scan the shoreline with interest and respect.
It was a tense moment.
Finally, the robot looked upwards, towards the sky. It remembered what it had done, destroyed families and cities, demolished buildings that took years to make. It's entire existence had left a trail of despair and destruction.
As it stared into the sky, something landed on it's head. A snowflake.
It lowered it's head in shame and began to march towards the ocean, dragging it's blades of destruction behind it. It continued until it reached the ocean floor, where it fell asleep for eternity.