A title sequence is the method by which films or television programmes present their title, key production and cast members, utilizing conceptual visuals and sound.

Forrest Gump

The opening scene shows a feather floating through the air which is flying until the end showing all the different buildings and surroundings. Then in the end it shows the main character who is played by Tom Hanks with the feather hitting his shoulder.... 

Skyfall 

The opening scene there is only editing. It shows what kind of genre it is. it starts with showing the main character James Bond, who fell into the dark sea.  

Seven

This opening scene starts with an extreme close up. This camera shot stretches through the opening between many different short film scenes are black parts, where the titles of the actors are shown.