Sabotage (1935)

I researched an Alfred Hitchcock film to observe certain techniques i can use in my Thriller opening. In his 1935 hit 'Sabotage' Hitchcock uses Suspense to great affect, so well in fact that now days he is known as 'The master of Suspense'
The plot of the film in short is that a young boy has to deliver a film canister to his uncles film studio by 12 O'clock, however the dramatic irony is that we as the audience know that the film canister is actually a bomb, that is set to go off at 1:45 pm. This creates suspense throughout the film as we as the audience are hooked to the film as we want to know whether the boy delivers the film, whether the bomb goes off and whether the boy gets harmed or not.
Hitchcock uses music to create the suspense, he uses music like a clock ticking to build up the tension of the bomb going off as we don't know whether the boy is going to get to the film studio in time or not.
Throughout the sequence Hitchcock keeps showing shots of a clock followed by the ticking music (the sound of the music is parallel and Diegetic music) the clock emphasis the tension further as we keep seeing the time getting closer and closer to the time the bomb is due to go off.
The fact that we as the audience know that the bomb is in the film canister and that the young boy doesn't is a use of Dramatic irony. The dramatic irony is that we know the boy is carrying a bomb but the boy doesn't. This means that we get really tense when we see the boy taking his time around a busy london as we don't want the bomb to go off and kill everyone.