The fantastic smile method

During my photographic investigations I came to the conclusion that the easiest way to get a fantastic smile is to get very close. Because a fantastic smile is one that cannot be helped and therefore cannot be faked. I would advise, though, my fellow photographic investigators to use their intuition before getting too close. Because what in one person could trigger a smile, in another one could trigger a reflex movement of an arm or leg due to the fear of being forced to give a fantastic smile. And this could have catastrophic consequences on a PI's camera.