self defence and dengers

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since I was a kid I had a special concern for my personal security. I'm not really afraid as I walk around, I actually often adventure myself, but I like to have "at hand" something which might help me out of some dangerous situation. It's some time now I'm carrying with me one of those sprays they sell which temporarly blur someone's eyes. Is any of you concerned about the same? Have you ever found yourself in some dangerous situation you manage to solve or to escape from?