Examples of short thriller sequences.

In the preparation process I've researched for short thrillers to see how the tense is created in the other opening sequences.

I quite like this one - it starts in black and white and then turns to colour after the girl is attacked and wakes up - which brings a sense of relief as the audience believe it was just a nightmare. 
But then we see a blurry figure behind girl's back.

I loved this one! This thriller is a bit too long for what we have to do, but I like the idea it also have a really powerful and vengeful female villain.

This thriller has a really good tension built up and the final twist is just amazing.