Stop, drop and roll. It's a lesson from elementary school that may have saved this man's life. A runaway truck with an unconscious driver sped into a gas pump in Clarksville Tenn., causing a fireball that engulfed the truck and a nearby gas station customer.

Bystander Chris Porter escaped the flames with his life, but suffered severe burns on nearly half of his body. Porter was rushed to Vanderbilt University Medical Center where he is currently listed in critical, but stable condition. Amazingly, the driver walked away uninjured. The cause of the accident is still under investigation.

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