I used to have a video of the Boston Fire Rescue squad setting one off. They were working on the backseat passenger of a Mustang that had hit a tree sideways, and his feet were pinned under the driver's seat. They had already cut off the roof and were using the jaws to pry the seat up. The control module for the airbags was on the transmission hump between the front seats, and they had the jaws against it. One firefighter was leaning over the passenger front seat, the other over the driver's seat when the bags went off. The guy on the passenger side was thrown into the "B" pillar, breaking several ribs and puncturing a lung. The guy on the driver's side was thrown 20 feet through the air, landing on his head. He had multiple broken ribs, a fractured vertebra, and a closed head injury. Quite a bang! Ever since I saw that video, I was always very careful around them when working car accidents. Scary stuff!