Interesting timing on this thread. I was riding to my girlfriends place Saturday afternoon when I came up behind an older woman being walked by her dog on the left side of the path. First I rang my bell, then I said passing as I went around and then she noticed I was there. She said something about how I should say "beep beep" beforehand, and when I rang the bell again she points to her ears and says something about not being able to hear because she's old before she started to apologize.