Thriller ideas

At the begining our group came up with the idea of a group in the forest and seeing lights (see in thriller planning folder) but this was dismissed as the lighting would be too dark and is to complicated for a two minute opening to a thriller, we now have to come up with new ideas for our thriller.
Some ideas that I think would be suitable would be: 

• Victim being followed by "something" (person, animal, something else) and getting more and more agitated as time goes by. Climax at point of ending.
• Starts off with a news reporter standing outside a grave yard, talking about a group of teenagers who went missing, it then cuts to footage of the previous nights, where the camera is being held by one of the teenagers at the climax of the incident, the camera is moving quickly to confuse and disorientate the auidence. Noise of whats happening can be heard but not much can be seen. Maybe the heavy breathing can be heard of the person holding the camera. Its only a plan, I don't know how it could end, but would end with all teenagers possible all dead.
• Postman discovers a dead body in a house, camera would be on the perpective of someone hiding out, maybe the murder then follows the Postman into the house to kill him.
• Man in a scince lab, working on some cure for some illness or disease, the perpective of the camera is of someone there in the lab intending to not been seen, meaning the views of the sciencist would be of his back. The camera gets closer, with the person, who then goes to kill the sciencist and steals the chemcial being used for a cure, it then finishes.

These are thoughts of a thriller opening I have thought over and developed, hopefully one of these ideas can be incorporated into the final thriller opening in some way.