The document summarizes the opening sequences of four films:
1) Psycho (1960) - The opening relies heavily on sound to set the horror/thriller tone through non-diegetic music with fast strings and orchestra.
2) Gattaca (1997) - It depicts a technological future through a sci-fi lens, using extreme close-ups of fake body parts and medical imagery.
3) Texas Chain Saw (1974) - Dangerous equipment and a close-up on a masked face are used to emphasize the horror genre through fear and discomfort.
4) The openings aim to create intrigue and leave the audience wanting more information through limited revealing of characters, plots, and contexts