In 2009, I shot a small wedding and the groom's parents didn't want to pose for 'pictures'. I respectfully asked if they would allow me to take a few with their grandson. They agreed and ended up loving the images.
About a month later, the father/grandfather died in a freak accident while at work. The mother of the bride asked if I was able to provide a framed image to the family for the memorial service, and I was happy to be able to do so.
I recently shot the bride's sister's wedding and the groom, whose father died, said that they are so happy they have the images of the family together. At the time I took it, I didn't realize how important that particular image would be to them.
To this day, every time I look in the viewfinder, I realize the importance of the people and images we capture and the responsibilities we have as photographers.
Thanks Stephen, your story makes such a strong point about the value of every image. You never know how it's going to be used or its value later on.