I took this picture of King Louis IX in front of the Saint Louis Art Museum and was disappointed to find that I had completely blown the focus. Instead of Louis being sharp, his horse's head was the focal point. Ugh!
But when I looked at the horse, I was struck by a funny thought (funny to me, at least). So I just kind of went with it, defocused Louis even more and then made adjustments to make Mr. Ed even more prominent.
Probably not my best work, but it beats leaving something on the cutting room floor (figuratively speaking).