Millions of cars have recently been recalled -- including some made by Honda and Toyota -- due to the fact that the airbags could actually explode. The highest concern for this, according to some reports, is in areas with high humidity. The humidity in the air and the propellant in the airbag combine in a way that makes an explosion more likely than in drier climates.
One woman was killed in Florida when this happened to her. She was driving a Honda Accord, which is a mid-sized sedan. After she got to the hospital, in the wake of the accident, medical workers thought it looked like she had been stabbed in the neck. She eventually passed away from those injuries.