In Chronicle (Blu-ray release 2012-5-15) Teenagers get superpowers and use them not to save the world, but to play pranks on others.  I watched a trailer of it previously but it was not really exciting.  However, the movie turns out to be more interesting than I thought, although there are more useless dialogue than I would like.  Its concept is new to me, and the climax is well done for this story.