Looking into the codes and conventions of thriller genre

In most thriller films, and their trailers, the codes and conventions of the genre largely depend on quick cut editing to create a fast pace to the movie/trailer, music and lighting is also largely important to create tension, use of light and dark, if used correctly creates a sense of mystery, combined with music can create a very powerful atmosphere, and create unbearable tension and thrill.

Noticable in most thrillers are the use of mirrors,  the different angles used filming this, and the use of a regular household object, and the unexpected appearance of a villian in the mirror creates fear in the real world, making the effect of the movie/trailer even greater.