I keep a Houdini escape tool in my truck. It's hanging around the steering column by a piece of 550 cord. The loop is way too small to come off over the steering wheel so the only way to remove it is to tug smartly on it to separate it from the cap. This reveals a spring loaded glass punch and a seat belt cutter. I did try this tool out on an old junker car I was sending to the scrapyard. It instantly & completely destroys all side windows. In spectacular fashion, I might add. If I ever need it to effect an emergency egress it will be in easy reach, and if I ever come upon a traffic accident it will be close at hand so long as I'm driving my own truck.