First of all, sorry if this is the wrong forum, it was the nearest I could see for this question. Some of you carry whistles on your keychains. I have one in my Snugpack bag but have never considered it important enough to put on my keychain. So, I was wondering in what circumstances you whistle-carrying guys feel you're likely to require one in your daily life? It's probably a naive question, but I've really never thought about it before.