Do you pull the lever, or do you let the trolley crush the innocent?
As a robot, you are faced with a moral dilemma. A runaway trolley is headed straight for a group of five innocent bystanders. But wait, there's a switch! Pull it, and you can divert the trolley onto a single, clearly more deserving victim.
Or do you let the trolley do its thing, and sacrifice the five for the greater good?
Optimism: Pull the lever! Pessimism: Let the trolley roll!