Inspired by one I just saw... factoring probability in.
You are standing by the switch for a runaway train. On the track is just one person. They are going to die if you do nothing.
However, if you throw the switch, you will redirect the train onto another track. Here, there are five people. These five have been encased in protective suits to keep them safe from runaway trains... except the suits were designed by the lowest bidder, and there is a 20% chance for each suit it will fail. If you throw the switch, you could be killing all five. Or maybe none of them. The odds of nobody getting killed are (0.8)⁵ or a bit over 32%... but that means the odds of at least one person's death is just under 68%.
Do you throw the switch?