2 secs: A book is being held, looks quite an old book.
3 secs: A title comes up, "Newline Cinema Presents".
7 secs: An inter title is shown, the font is white and black which could connote this is set way back in time.
8 secs: Distorted hands appear, they look dirty,bloody and grubby, quite scary and peculiar.
13 secs: Actors name comes up, "Brad Pitt"
16 secs: Close up of the hand holding a sharp razor blade, and then starts to cut his fingerprints of. This connotes
maybe he`s trying to hide something or be unknown, it is very suspicious.
18 secs: Actors name pops up, "Morgan Freeman".
23 secs: Title of the film, "SE7EN".
24 secs: Title flashes bigger.
29 secs: Actors name comes up, "Gwyneth Paltrow".
34 secs: Close up of some writing, some overlapping images that may link into the story. Actors name comes up, "Richard Roundtree".
36 secs: There is a red filter which may connote danger, something is about to happen or happen later.
39 secs: The blooded hand comes up again cutting up some film, maybe he could be hiding evidence. Very suspicious.
43 secs: There is a collection of photos, paper and clips. Maybe the person it the title sequence is making something.
52 secs: Then the suspicious man starts to cut up some newspaper, again very suspicious, maybe he`s sending someone a message, trying to cover his identity. New actor, "John Cassini".
61 secs: There is a POV shots of the man crossing out words in a script or book, again very suspicious of the character.
71 secs: The man appears to be crossing out or drawing over a picture of a boy.
74 secs: Another red filter comes up during the crossing out of the boy, connotes danger maybe for the young boys safety or has the crime already been committed?
85 secs: Grubby hands appear while he is marking books.
90 secs: An arrangement of photos are sprawled across the table/desk, maybe he is creating something or researching something?
96 secs: The person is playing with a sharp needle. This could connote he is depressed or self harming, or it could be a tool to make something with.
102 secs: Appears to be threading the needle, connotes he is making something or doing something sinister.
107 secs: He appears to be binding together a book with the needle.
118 secs: More photos and some hair samples, the hair samples could connote something bad.
This title sequence already puts the frightners on the viewers, we cant see the face of the assailant. We can only see his tool and props and the behaviour is very suspicious. Also the non diagetic sounds create a scary atmosphere for the viewers.