> This lens isn't as impractical on a bustling street, but you still be far enough away > that they don't pay attention to you, pick someone who's already looking at something > in roughly the direction you're facing them from, and snap what's actually a candid > picture where they appear to be looking at the camera. You get far more natural looks > than you do if you're asking for poses.
You must get someone flipping you the bird from time to time if you do this enough.