This is now the thing to do, apparently. As a portrait photographer, used to controlling lights/backgrounds/models/etc, this candid photography makes a change for me and also stretches my skills. All done with grab shots, mostly unnoticed by the subject(s). Spotted this young lady in town today - I love the way her hair matches her clothes.
This is literally 'street' photography: guess who should have known better on a very windy day, and ended up wearing a large amount of the snow foam! lol