I staked out a position by a plant known around here (my backyard) as “Indian Tobacco.” The hummingbirds love it, so I prefocused on one set of flowers and waited.
I heard the bird, and immediately lost all discipline. I tried to follow it to all the different flowers it visited, and never got a shot off. Of course it ended it up at the flowers I originally staked out. By the time I caught up and focused, it had moved behind the flower. Had I stuck with my plan, I would have gotten six or seven shots of the full hummingbird feeding at these flowers. Instead, I got this: