In other words, the opening should suck audience into the movie rapidly, as soon as they start to watch the movie. Sometimes, the idea of something BIG is used, to create a spactecular opening for example in Cassino- the character gets into his car, then the car explodes.
|Robert De Rino walks toward the car and gets into it....|
|....and then the car explodes...|
While watching the opening, audience starts to make immidiate adjustents about what might happen next. I think that good opening should set the tone of the movie, and get audience ready for what's coming, set them in the right feeling. Hitchcock 's words: "We should give some informaton to the audience, so they know something but not everything". And I agree, and this this is part of what makes a good movie opening.
A classic opening, is where a movie starts with an establishing shot and they gets into the movie. Stanley Kuffman gave a good example: establishing shot of New York, then close up of a window, receptionist/office and then actor and that's when the movie starts.