II have been practicing a common street photography technique which involves exposing for the highlights in a scene where there is high light contrasts. In other words under-exposing the scene by 1 or 2 stops. It provides a very dramatic effect and can be used to focus the viewers attention in on a person in a crowded street.
The shot below was very tricky to expose due to the extreme contrast of the scene. I decided to preserve the highlights, allowing for the surrounding to lay in the dark, simply by underexposing by 2 stops.
This technique is used by many, but best used by these photographers, Katrin Koenning.