From the London Daily Telegraph, courtesy of Elizabeth Longo:
A medical professor whose car hit a tree after he suffered a cardiac arrest was brought back to life when the impact of the steering wheel against his chest restarted his heart. Professor Ronald Mann had a heart attack while driving, lost consciousness within seconds, and though his front seat passenger tried to grab the hand brake, the car crashed into a tree. The impact caused him to jolt forward and hit the steering wheel. It split in two, but the blow restarted his heart. The fact that Professor Mann's 10 year old Honda did not have an airbag also contributed to his survival. Dr. John Morgan, who treated Professor Mann, said, "He is a very lucky chap. ... Hitting the steering wheel brought the heart back into a normal rhythm and shocked it into working again. Had he not hit the steering wheel, he would have been dead. We have now implanted a defibrillator that can shock his heart back into normal rhythm again. It is definitely a safer way of doing it than using a steering wheel."