This document discusses trends and techniques in horror films over time. It notes that monsters and fears change with each generation to remain relevant. Some key techniques discussed include catching the audience off guard, using scary music, implying that sex leads to death, and ensuring the monster never truly dies. Psychological horror focusing on everyday people as the scariest killers is also examined. The document traces how fears of technology, religion, sexuality and more have influenced common horror film tropes. It analyzes the cultural impacts of influential films like Psycho, The Texas Chainsaw Massacre, Halloween and others.