Student thriller analysis - Derilium Tremens

I thought this opening sequence was quite effective, the fact it was in black and white to set a mysterious tone and then when it cuts to the two men in the car and then the music comes in it suits the atmosphere. It manages to confuse the viewer as they are unaware as to what will happen next, and also to quite what is going on, but It keeps them intrigued, as they want to find out, why are they in the car? What do the flashbacks indicate? Where does the other man form the car go? All of this makes it an effective and suspenseful opening.