The only reason I'm answering this is in case anyone who has ever lost someone to a fatal accident reads it. I've often heard people who have lost someone that way say that they wonder what the person was thinking about right before.
I was in an accident in which my friend was killed and I truly thought there was no way anyone could possibly survive what was clearly about to happen. We were in a tiny car, a convertible, and there was a high-speed, out-of-control, set of headlights coming right at us. I calmly said to the driver with disgust and contempt, "He's going to hit us." I didn't say it, but I thought there was no way on Earth anyone in our car would survive. I didn't have a lot of time to think, but I was surprised at how calm and resigned and disgusted at the other car I felt. I was twenty years old, and my thoughts went immediately to my two parents, whom I imagined must be sitting in their kitchen and having their night-time coffee and crackers.
I thought, "I hope they know that I'm OK with this." That's not saying that I was OK believing I was about to be killed, but I was calm and resigned and not all that upset. I was angry. Ridiculous as it may seem that I actually seriously thought this, I hoped they wouldn't feel too bad about it. I don't recall if I only "thought it" or if I "prayed it". It's what was on my mind, though. Also on my mind was the thought that this wasn't one that was going to be avoided.
My own calm words are clear in my head today, and nobody else in the car said anything. There was no drama and no screaming, calling out prayers, or horror as some people may imagine there would be. I don't know what my twenty-year-old friend was thinking, but she looked like she was calmly "addressing" the situation. I suppose it's because adrenaline makes people react with calmness.
I didn't feel the actual moment that "the headllights" hit us or if I did I don't recall it because of a head injury. I temporarily regained consciousness when the emergency people were already there, and I had trouble figuring out what he was saying about how we "had just been hit down the road". I felt like I was being awakened from a routine sleep and didn't want to be. In other words, immediately after being hit it was like I'd lost memory of what had happened. As I gradually became more awake I recalled most of it.
A real case of "not knowing what hit us".