The Watching Documentary shows the ins and outs of most iconic thriller opening. It also teaches us how to get a good opening.
'A good beginning must make the audience feel that it doesn't know nearly enough yet, and at the same time make sure that it doesn't know too little' This is because the audience needs to be drawn in and given enough information to keep them wanting more. If they do not know enough they will start to feel bored and un interested.
'Instant Arousal' is when the opening has an immediate and lasting effect on the audience. This can be a good thing as it gains the attention so early in the film, however, Director Jean Jacques Beineix makes the good point that it is har to follow a strong opening.
The 'classic opening' is a series of shots that establishes a character, what they do. For example, a shot of a city, , then a building, which tilts up to the top of the building, then a shot of a window, then the character inside the room.