None yet, but it's always in the back of my mind that somebody will come out of the woodwork. I'm usually thinking "what if they take my camera?" rather than "what if they chop me up into little pieces?". I was photographing at the end of a long rural driveway the other day and a burly looking guy approached and gave me some location tips! It was also near a train station and my first words to him were "don't worry, I'm not a train spotter". Actually, I get the impression people are more scared of us. We're like spiders.
People are generally politely curious in my experience. But then again, I don't do street photography... only driveway photography. Maybe I'll branch out to people's gardens at some point, who knows.