A classic scenario was brought up in my Ethics class when we were talking about utilitarianism and consequentialism.
You’re walking along a train track, and you notice a trolley that is out of control. There is a man within arm’s reach, between you and the track. He’s large enough to stop the runaway trolley. You can save five people on the trolley by pushing him onto the tracks, stopping the out-of-control vehicle, but you’ll kill the man by using him to stop the trolley. What would you do? Would you save the people on the trolley, and in result, have the man killed? Or do nothing and let the trolley crash, having the five on the trolley killed?