When I got hit by the car, I rode the dashboard for a bit until the driver panicked and hit the breaks to a cold zero, sending me flying with the momentum. My first reaction was to cover my head and roll on the ground to lessen the impact (thenks martial arts for my life, though this fucked my arm up, but better the arm than the head). When I was finally on the ground, still and not in any more danger, my first reaction was to stand up and throw a friendly joke at the driver. Of course, I couldn’t stand up, because my leg was broken, but I still said the joke, apparently. I do not remember it because I was dizzy, but I am told that he couldn’t hear it over his panic.
So basically, 1) shock is, indeed, one hell of a drug that makes you do and say weird stuff, and 2) that is a joke lost to the sandstorm of time, never to be retrieved.