Just out of curiosity - is anyone else here bothered about using sound-isolating headphones in situations where it might be wise to be able to hear what's going on around you? E.g. I've never been able to use headphones whilst walking outside for fear of not hearing a car whilst crossing the road, etc. This is a personal thing, I guess and I'm not saying someone's wrong for not doing this. Just curious as to whether I'm alone in my behaviour.