Saw title sequence analysis

the opening to the horror film "saw" in my opinion is an extremely effective one. the titles themselves not being of great length, however there is a very prominent and powerful use of non diegetic sound, with the "liongate film" promo at the start having thunder clashing creates an angry mood and sets the correct atmospheric tone for the film. the next promo company is "twisted pictures" the name alone gives the feeling that the film is to be rather sinister, and "twisted", the diegetic sound accompanying said promo, is the sounds of knives slicing, this gives enhances the fear within the viewer even before the film has begun. the titles themselves are very simple, with just blue writing on a black background, the writing is shaking slightly, gives the feeling, that the pace and action of the film will oscillate vastly throughout, creating an uneasiness. the non diegetic sound is heightened within the titles, there is a rippling, bubbling kind of water sound, with the audience not being able to recognise immediately where the noises are coming from, a sense of mystery is created, setting the scene for the remainder of the film. it then becomes apparent where the noises were coming from with a close up and point of veiw shot on a mans face under water, being slightly illuminated by a small light. and then the film begins.