Sometimes it all comes together. The guy on his bike, not just any old bike but quite a nice singlespeed with leather saddle and matching leather handlebar tape. Plus a fashionable canvas bag with leather trimmings. But also in the background, that character outside the Japanese Canteen perfectly silhouetted against the rectangle of white, dressed with un-missable bravado and swigging from a can of Coke. You can't plan a shot like this, it's just there and either you get it or you don't. It could have been better focused but at least you can see what's going on. Usually it's gone before you can even think about pointing a camera. Having a camera in your hand helps but the odds are, if you're trying to take photos you walk for an hour and see nothing really worth photographing, take a few shots and delete them later. Other times you just have the camera in case, not really planning to take photos but just out of habit, and something makes you switch it on and point just at the right moment. You could drive yourself crazy always being on the lookout for an interesting shot, better just to carry a camera and see what turns up without looking for it.