"Devil"

Five strangers share an elevator that gets stuck between floors.  Strange things begin to happen soon after.  The lights go out and when they come back on one of the five passengers has a large cut on her back. She says that it felt like something bit her.  The lights continue to go out sporadically throughout the movie, and every time they do someone dies or is injured.  You can never actually see what happens when the elevator loses power because it is completely dark.  The idea of this movie is creative, however the movie is boring and never scary.