Jeremy, John, You guys need to work on your mind-clouding skills. You may both be too young to remember the Shadow, but quite a few years ago on the radio the Shadow could make himself invisible by "clouding men's minds," and thereby secretly learn "what evil lurks in the hearts of men." I'm not sure you need to make yourself invisible to find out what evil lurks in the hearts of men; all you have to do is look around. But I think you more or less have to make yourself invisible to do street photography.
I think I was doing street photography in Manitou Springs about the same time Jeremy was doing street photography in New York City. Here are four from my shoot:
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I made the restaurant shot through a window in a hallway. Of course no one saw me shoot that one. The guy with the guitar saw me shoot but couldn't have cared less because he was hoping for a handout. The guy in front of the coffee shop never saw me shoot because the camera was hanging at my side when I tripped the shutter. The guy carrying the lemon and the frond saw me raise the camera and shoot, but he wasn't really sure I did it. That last thing is most important. You've got to be casual and not make sudden, jerky moves, but, above all, you've got to be quick. All of these shots were with a Nikon D3 and a 50mm prime lens. None of them are cropped.
By the way, Jeremy, in one of his books, HCB mentions being chased a couple of times. You're in good company.