There once was a man who made a robot who could lift things. He programmed it with camera to identify nearby cars and to go lift them when necessary.
Year after year, without much AI intelligence, it lifted cars with strength and efficiency.
Finally, the robot was given a new definition of car, given a new image of what it is - the shape of human beings.
So for the rest of time, it went around the factory lifting humans with the same strength and efficiency as it lifted cars.