hahaha! copyright fees? if i were you, i would have told him... yeah, i'll give you copyright fees, only if your face got my fist mark on it! silly s*^t! joking aside, walking away is always the best choice...
aim at something else, then shift quickly, snap, and then walk off
don't even need to act guilty, just do it like you never snapped them, that is the best way to do it, most people will not bother to check
for those who do, they will be oversensitive and you can sense it the moment you are around, so you don't snap. the more time you spend doing something, the better attuned you are to it.
anyways, these are from my experiences in london, i have not tried street photography proper in singapore, so i couldn't say for sure, but you can take a look at sathea or lancey's shots here, they seem to be able to get pretty close to their subjects....
Someone (calebk?) once said that if you have no people skills, perhaps you shouldn't make streets and candids your main photography interest. Or, to put it another way, to be better at streets and candids, you should try to develop some people skills.
Edit : hey, here's an idea of a posed photo. Get a really fierce looking model, and have him / her walking towards the camera as if going to beat up the photographer.
for me i'll usually point my cam (spell, dslr = big camera) to somewhere near my supposed "subject", then when i see the moment, i move over to my subject, focus and shoot! den bring gun, i mean cam down and move. usually no time for them to react or i'm already on my way ;p good if you can snipe but sometimes pretty tough, depends on situtation. in general, need quite a bit people skills la. sometimes you were "caught" shooting, can just smile and wave. (never hurts to be polite). if given the middle finger or !@$^*, just walk away..
in my experience, it was really scary at first, but when you got used to the surrounding the fear will go away.At first i was sniping around the corners of the sidewalk, then i slowly started snapping pix in the middle of the street trying to blend to the crowd.
but if everything didnt go well, my advise is dont run, just slowly walk away or do the "testing your camera trick" or "im taking photos on whatever on your back trick". it takes a lot of courage not to run but running will just give them the idea that your stealing something from them.
and show some respect, if you see theyre staring at you and you felt that theyre not comfortable taking theyre pic, dont click and redirect your lens to other subjects.