how can a film opening attract an audience?

When a film grabs your attention from the opening frame, knocks you out of your seat or even grinds you into it, you tend to remember it fondly, even if the rest of it fails to measure up.The opening should tell us the genre of the film & the setting or location The opening may tell us one of the storylines of the movie to keep the viewers watching and to give the audience a taster of the narrative. The opening should include many different techniques, from catchy music to fast paced editing. The most important element to a good opening is the element of suspense.