Red herrings

Red Herrings are used to divert the audience from the thruth this makes them think they know whats going on or whats going to happen when really the completely opposite is happening. This technique could also be use to create tension and suspense. For example this is used in the film Psycho as you dont see the mother the whole film you only hear her voice this makes you assume that the mother is the one behind all of these myserious deaths when really its her son. Using this would really shock and impress the viewers.