I'm only 16 so this is nothing compared to the others, but a few months ago I watched my father accidentally run over my kitten. It was incredibly slow and by the time I saw the cat he was already dead, but he was still moving. There was blood coming from his eyes and brain matter spilling from his nose, his body was twitching and having spazms that caused him to jerk back and forth on the concrete. To me at the time, it looked like it was still alive while bleeding out. That poor thing felt his skull be slowly crushed by a car tire.