Nightmare + Car Accident

I was in a car with what I assume were friends. Though I don’t remember who they were or there faces. I was in the back sit. We were on the highway, we were all laughing and having fun. I was holding my left arm close to my body with my right hand. I’m not sure why. I went to look down at my left arm, with a puzzling expression on my face. As I did I remember time slowing down, noise