I do agree with the point about always having your camera on you... although I'd already uploaded today's pic, when i went for lunch I saw a man in the middle of a busy street dressed in full gym gear doing press ups!!!!!!!!! Whether I'd have taken his pic or not I don't know, but was def funny and worthy of snapping.... So from now on, my P&S will always be in my pocket....
great post!
Such as you see a perfect opportunity for a photo and you don't have your camera with you.