Lady on the phone
Sometimes you'll take a photo and think it's not great. Occasionally you'll spot a photo within the photo.
I was attempting to photograph two lads walking down the street but when I saw the resulting image they were blurred by motion and out of focus. A closer look later showed this young lady on her mobile phone, and a man looking after her in the background.
Quite a bit of cropping, and this photo is only a 1/3 of what the original was!