Advertising, graffiti, road signs, shop names, van signage, estate agents' boards - the street is full of text. When a person walks in front of or beneath the right words, the picture makes itself.

'SALE' above someone who looks miserable. 'OPEN' next to a closed expression. The accidental caption.

Watch for: being too literal. The best sign-and-person pictures have a gap between the words and the human - the meaning isn't handed to you, you have to find it.

The point: language on the street is a ready-made layer of meaning. Use it.