Ideas and brainstorm

My first idea for a opening film is a horror themed.
The opening would start with a person's POV walking around the streets at night, while light stop to work and a child appears not far away in front of that person with its back facing the person. The person asks "Hey sweetie, are you lost? Where are your parents?" and comes toward the child but then the child turns around and screams, the person trips on the floor and tries to crawl back but all you can see is a blood spraying on the floor and buildings and a big shadow passing by. To develop it further I would need to work on the details of characters and as it is the horror genre - make up and clothing will play a huge role in it however to make it original I should try going further then how people look in stereotypical horror movies.

My friends idea was to make action based film opening. The opening would start with a person hanging  out with friends like nothing is going to happen but then the person has a car accident and wakes up in hospital/bed with wrapped face with bandages, the person takes it off and sees herself/himself in the mirror but sees completely different person, like its not in the right body.

As a group we decided to use idea number 2 and together we decided to change it a little. From our questionnaire it seems like most people choose action and fantasy genre so we decided to use it and make our film opening based on it. Person after accident would wake up but will look down at its own body, it would be a ghost, but she/he can't go to "the other side" because something is holding that person back - its murder. It wasn't just an accident, it was all planned and the person need to find out who did this to be able to rest in peace.