"The air in their lungs… would expand so quickly they would explode."To keep this simple, we'll talk about the scenario as though some people were somehow tossed out at 30,000 feet and landed on the wing of a 737--maybe "if someone didn't like them," says Jason Kring, assistant professor of human factors and systems at Embry-Riddle Aeronautical University. The first problem is obvious: there's not a place to hang on to the exterior of a plane traveling 400 or 500 mph. But say they were strapped down to it (someone was really angry, presumably). At 30,000 feet, while trying to breathe, "the air in their lungs… would expand so quickly they would, for lack of a better term, explode," Kring says. Boyle's law says there's an inverse relationship between atmospheric pressure and the volume of a gas. That doesn't bode well for people's lungs, which would "expand like a balloon."