Right, so yesterday I was out photographing using my new 15mm lens, looking like the living dead after about 3 hours sleep. My mum, her friend and I went to a food festival which was being held in the town of Abergavenny not far from us. We were walking around the streets which were pretty packed with people when we walked by a busker out on the street playing on his guitar. Quite a tidy looking guy wearing a pork pie hat. I decided to take a photo so walked up close beside him as he was singing and took a photo down the street. He was included in the foreground of the shot but my lens was pointing nowhere in his direction. I stepped away and went to join my mum and her friend when I heared "Oi you, guy with the camera." So I turned around and said "Yeah?" to him. "Did you take a picture of me just then?" to which I replied "no". "Ah right, because that's pretty rude if you did. Why didn't you ask. Hundreds of people take my photo" or something along those lines. "ah, alright, uh sorry." is all I said. This is the first time anyone has ever confronted me about having their picture taken candidly by me. Later I saw a guy with his cameraphone pointed right at the same guy and taking a photo. It wasn't much of a confrontation but was I wrong not asking for permission? Instead should've I interrupted him in the middle of playing? The bloody lens wasn't pointed anywhere in his direction anyway so why get so uptight? Shared any similar experiences?