When you haven't got your camera.

Sometimes you see something that would make such a perfect photograph that you are annoyed that you don't have your camera with you.

My Metro stop overlooks some municipal football pitches and, as I was waiting this morning, I suddenly noticed that on one of the pitches a flock of geese had landed at the north end and were all lined up facing south. Meanwhile a flock of seagulls had landed at the south end and were all lined up facing north? It looked for all the world as if they were waiting for the referee's whistle to start the game. It would have made a great picture.

Sadly you'll just have to imagine it.