Thrillers are a genre characterized by suspense, tension, and excitement through depicting society as dark, corrupt, and dangerous. Thriller trailers aim to build anticipation and tension by starting slowly to establish the storyline, then speeding up and only showing brief clips to leave viewers wanting more. Effective thriller trailer techniques include using quiet music sometimes with nursery rhymes, showing the story as initially normal, employing well-known actors including past villain actors, incorporating heartbeats to set the tone, and utilizing transitions like fades and flashes (sometimes simulating lightning).