Harvard University: Michael Sandel's "The Moral Side of Murder"
Watch the first half of this video until 24:12. Compare your own intuitions about the cases introduced with those voiced by the students in the video. Also, note the definition of moral skepticism introduced here. This video lecture presents a classic moral dilemma: whether it may be morally permissible to commit murder - or to allow someone to die - if it is certain that doing so will prevent an even worse catastrophe.
Click http://theopenacademy.com/content/lecture-1-moral-side-murder link to open resource.