Why _wouldn't_ I carry the jaws of life with me whenever I use an elevator? I'm taking my life in my hands every time I enter an elevator and the only reasonable way of approaching the world is under the assumption that every elevator represents the end of my life if I am unprepared.
I used to see this one patient in the home, a quadriplegic. He had a revolver at bedside at all times, for self defense. He ended up dying of infection.