I've considered getting pepper spray -- http://www.pepperblaster.com/ is one that the bike class instructor had -- and then considered getting the "training version" instead, especially if I could put something less noxious but very marking ... so that people who "only" threatened me (as with that lady) could get a message. Only considered it so far... and I do want to get my camera set up... but oh, just about *everybody* on my route is friendly to a fault.