A trolley is running out of control down a track towards five workers who can't be warned in time. You are standing within reach of a lever that could divert the trolley to a siding, but there is a single workman there. Would you pull the lever and kill one to save five?
Suppose a very fat workman (large enough to stop the train) was on a bridge with you and you could save the men only by pushing him onto the tracks yourself?
Or suppose that you could throw a switch to drop the fat man on the tracks, thus not actually physically pushing him?
Would you divert the train? [y/n]
Push the man? [y/n]
Throw the switch? [y/n]