The art of a title sequence

First of all, what is a title sequence?

A title sequence is the method by which films or television programs present their title, key production and cast members, or both, using relevant or effective images and sound. It usually follows but should not be confused with the opening credits, which are generally nothing more than a series of layers of texts.

What's the difference between a title sequence and opening credits?

The title sequence of a film is the opening scene(s) that include dialogue and often action, whereas the opening credits show the cast and crew in writing, often accompanied by a song and/or some acting in the background.

Cirque du freak: the vampires assistant (2010)

http://www.artofthetitle.com/title/cirque-du-freak-the-vampires-assistant/

Most title sequences have a sense of autopilot, the main title for Cirque du Freak: The vampire's Assistant keeps you guessing. Taking on the role of a children's nightmare, the result is innocent but with the intentions of creating fear- a sure way to take the edge off the sweetness.

The title sequence gives you a small idea of what the movie is about. The scenes/images sort of invite the audience in, making them want more, but not giving anything crucial away.

The idea of a title sequence in thriller/horror movie is to prepare the audience for what is about to come, by showing certain places/people (etc.) from the movie, making the audience feel almost comfortable before the movie starts.