Snatch

In thriller films the opening sequence tends to be a flashback or something happening in the future that then builds up to the story thats going to commence. In this particular case the story's introducing a few of the characters in the film. A raid is taking place to steal a diamond which links in with the film. Snatch in particular is a film set where each scene contains a different et of characters, and consists of loads of stories which in the end a linked together.