When a few years ago the bridge near Minneapolis broke and people ended up in the river drowning, I wondered how I'd get out of my car if, say, the bridges I use daily that go across the Mississippi River collapsed. I guess this is the answer below.
This was demonstrated on the tv show, The Doctors, today (9/21/09) and their demonstration proved it to be a handy item to have if you ever got caught with a seat belt that wouldn't open and/or needed to smash your window open to escape your car. After finding it on Amazon.com, I read the reviews and ordered two in yellow for $21 and some cents.
You can also get a much larger version--which probably is alot better but has to be mounted on your dash somewhere--but the keyring style you can either carry with you or hang with a zip tie off your turn signal. Anyway, I felt it was of value and some here might be interested:
Amazon.com: ResQMe, The Keychain Version of the Original LifeHammer (Royal Blue): Automotive
Lord only knows I hope I never have to really use it, but if I'm ever in a bad auto accident where the seatbelt won't open or if my car catches fire and I get stuck in the car or if I do drop off the side of a bridge and am underwater, this little puppy should be mighty helpful I would think. For $9.95 or so for each plus shipping, I'll take the risk on this item myself. (If only poor Mary Jo Kopechne had one of these with her when she was with Teddy...)
Here's a piece on how to survive if your car goes underwater from The Today show. Pretty interesting with some great ideas: