I carry a large, expensive DSLR with me when I travel. I frequently get asked to take other people's pictures. The problem is, I haven't a clue how to work their camera. I usually forget that it will take a long time between when I press the button and when the picture goes off. And the worst is that I'm not even a good photographer. I just love it as a hobby and buy expensive gear in an attempt to compensate for my lack of creative vision. The lesson is that just because someone has serious photographer gear with them, don't be so sure that they'll take a decent photo with your camera