This was a part of a challenge I set myself to: I decided to grab a speedlight, a softbox and a black background and shoot random people I found on the street.
It was a pretty straightforward setup (I had two friends helping me -- one was holding the background and the other one was holding the light stand) and I spent literally 15 seconds in front of each person.
When I saw this dude walking by with shades on and that amazing hair, I knew I had to take his portrait.
Flash to his left, background behind him, and I took two shots. That's it.