Adam Savage has said that at least five different people wrote him letters saying the Mythbusters drowning car episode saved their lives
You have to either get the door open immediately or hold your breath until the car evens out
http://i.imgur.com/WWk7D.jpg http://i.imgur.com/hE7v5GL.jpg
http://i.imgur.com/sY9YLKe.jpg http://i.imgur.com/9e67vqt.jpg