You are on a bridge. You see a runaway train barreling down the rail ahead. There are five people working on the tracks. The run away train is headed directly towards them but they can’t hear you though you shout out loud. There is one big guy standing in front of you. The train will stop if you push him onto the train track and you can save five people’s live. But at the same time, the guy will die. Do you kill one person to save five people’s live or do you just stand there and see five people die?