Dramatic high pitched music - Usually associated with making the audience feel un-nerved and frightened, but at the same time, sets the atmsophere, enabling the tone to seem more climatic, as the film reaches the end. Violins are the common instrument used to create a disorientated feel and can help relate to the story in some films, however it is mainly used as a way to scare.
Blood and gore - Especially used within the Saw series, this convention is more likely used as a form of realism after a fatal injury, thus making the viewer feel sick and unhinged by some of the fatalties that the horror films have. However, this convention is not really original because it is only recently that this has been popular; since the horror films began, blood was used less frequently.
Location - This is also used as a factor in order to scare the audience and once again set the atmosphere in which most locations seem to be isolated. Darkness is also used towards a fear of the unknown and unexpected as to what may happen next. It makes the audience feel like they are the character within the film and feel emmersed within the fake reality therefore causing a similar feeling of fear and desperation.
Teenagers and Sexual content - Only recently introduced into the horror genre, this convention is sometimes used to shock the characters into a realtiy of the situation and add to the sense of isolation and desertion. Characters that are not aware in films seem to be the first to get killed and therefore could be considered the starting point of a series of murders, in order to get their fellow friends to work together and establish a survival plan. Commonly used in films like Wrong Turn and The Cabin in the Woods, this convention is not major when wanting to scare the audience.
Props - Usually associated with knives, weapons and generally anything that can be used to harm someone, are the props used in a series of horror films; the murderer/"Villain" usually wield something more powerful to overwhelm the characters and make their death seem inevitable.
Characters/Plot - Normally in paranormal films, there most commonly seems to be a child who is the prey to the ghosts and therefore could make the audience feel more concerned. The characters usually scream and make their presence heard by a bloodcurdling cry, and raises the question at the start of the film on whether or not the chracters will overcome the villain, or if they will succomb to it.