A trolley is careering out of control. Up ahead are five workers; on a spur to the right stands a lone individual. You, a bystander, happen to be standing next to a switch that could divert the trolley, which would save the five, but sacrifice the one—do you pull it? Or say you’re watching from an overpass. The only way to save the workers is to drop a heavy object in the trolley’s path. And you’re standing next to a really fat man….