Drafting and Planning

I researched what dramatic/frightening scenes you could include with a horror trailer to get the audience terrified.

There are certain objects / places where a scene is really set and i have worked on some ideas that i would use in my teaser trailer. 

Ideas

Bath scenes are most commonly used in horror films as you can always feel like there's something about to happen that's unpleasant. For example the main things that are used are when people fall asleep / the shower curtain when someone is behind it. These are key things in the teaser trailer, I have been thinking about doing a scene in my teaser trailer where there is a bath scene and the girl is coming up from the water and that can be when she hears something from outside of the door. I think this would be effective as it would be all of a rush then to what she is going to do. 

I think to cause tension in my movie i should have a close up on the tap dripping. This could be after she hears something with silence of that and then more noise. I think this should be the only slow part in the trailer as i want the rest to be quick cut shots and panicking etc

Another thing i would think would be effective to use is a phone ringing, in many films such as 'scream', 'when a stranger calls', 'the ring' and 'the caller' whenever the phone rings it causes tension as who is it? do they know them? if not how did they get there number?
I think in my film i would like to use this because i would want to like the tap keep causing tension. It could be the man that she thinks is after her calling when its just no one.

Also another thing I could think about is doors opening by themselves. As i am doing a trailer about a girl who thinks shes seeing stuff but they are really in her head there could be a clip of it opening slowly but then it slamming shut as its not actually open there could be a flickering light to add effect like shes back in the real world when it closes.

With my trailer i want to do loads of cut shots fast so it builds up and as i researched trailers it seems that the directors do this towards the end of the trailer and not at the start to build it up and then end it. I would like to have a flashing effect of some sort so every time a new shot comes on that happens and a Non-Diegetic sound happens to make the scenes more alarming to the audience.