What I noticed right away was the great musical scoring in this film and yes, the effortless and natural acting  exhibited by the actors.   Though there was nothing new in terms of plot,  ( there's a killer, all right, so what's new!) but the  scare factor, the shrieking, the  shaking faces and all contributed  to the success of this film  in terms of  scaring viewers out of their wits!  Gotta watch this, folks but first, remember to take a pee break!