Trolley problem

The general form of the problem is this:

The trolley problem: should you pull the lever to divert the runaway trolley onto the side track?

You see a runaway trolley moving toward five tied-up (or otherwise incapacitated) people lying on the main track. You are standing next to a lever that controls a switch. If you pull the lever, the trolley will be redirected onto a side track, and the five people on the main track will be saved. However, there is a single person lying on the side track. You have two options: