The title sequence I have chosen to use as an example in this blog is from the film 'Land of the Lost' as shown below -
http://www.watchthetitles.com/articles/00137-Land_of_the_Lost
The purpose of this title sequence is to promote a film with strange and fantastical elements based on the music and the various images used in the background. The images show everyday items such as a telephone box and an ice cream van (to show its a 'Land of the Lost'), creatures such as dinosaurs and alien-looking beings, and multiple locations such as a jungle, desert and a volcano. It also promotes some comedy elements when an animation of 3 people (the main stars of the film) running away from strange creatures is shown and one of the group trips over while running. This happens when a certain actor's name (Danny McBride) is shown on-screen which hints at Danny McBride's character being a rather clumsy and funny sort of person, keeping up with the tradition of all of his characters in previous films being this sort of character.
The text shown when crediting stars of the film and the people who helped make it consists of a funny sort of font. When certain letters are used in the names (such as 'I', 'L', 'N' or 'S'), the ends, beginnings or sometimes, the whole letter is stretched out so it goes off-screen. An example of this can be seen in this image -
This sort of writing continues the portrayal of strange and weird elements used in the rest of the opening sequence.
Many times throughout the sequence, the camera view tilts and spins through strange items and locations. This is a good example to show that this film is going to be a rather twisted and out of control film with a lot of peculiar and fictional elements.
The music in the sequence also helps create a confusing and odd atmosphere for the film's audience. It has a jungle vibe to it along with some dramatic and out-of-this-world parts which you would normally associate with sci-fi films that feature aliens. The audience would most likely associate this music to a fantasy comedy action film.