The sound of crashing metal, the smell of antifreeze, gas and oil, and the feeling of pain as you are thrown around the cabin of your vehicle all indicate that you are in the midst of a car accident. When your vehicle comes to rest, you make a quick assessment of your situation and feel lucky to be alive.
You may even manage to get out of your vehicle. Even though you feel some pain, you don't think much of it because you expect it. After all, you were just involved in a car accident and don't seem to have any serious injuries. The problem is that many injuries may not show themselves right away.