Approaching strangers and asking to take their picture can be a bit daunting. One impediment is the fear of rejection. And, of course, there will be rejections.
Jai Jaing found this out the hard way. After a painful rejection in his entrepreneurial venture, he read that 'rejection therapy' involved being rejected many times. I guess that the pain should wear off. So Jia started a project, "100 Rejections in 100 Days" and blogged about it. He explains the unexpected results in this 12 minute TED lecture. It is very illuminating, and entertaining.
If the video won't play on your computer, the link is HERE.