conventions of opening sequences

In the film 'The Hangover 2' there is a non-linear narrative where the story line is not in order, as the characters are first seen in a difficult dilemma  which the audience will have know understanding of.
 for example; www.youtube.com/watch?v=GuiBesJNlEE

Another convention of the opening sequence is in 'The Simpsons movie'  we see the convention of the title approaching the audience thus engaging the viewers and getting their attention; 

 Production brands such as Pixar are seen throughout the opening sequences of Disney movies such as; 'Toy story' , 'Monster inc' and 'Despicable Me'.

the conventional opening sequence in SE7EN we gain the hint of the genre and its opening plot due to the use of color which was mostly black , red , grey to represent  mystery and evil .