I got honked at by one of those electric scooter things in the bike lane on College yesterday. It was a friendly honk, just to let me know he was there. Those things are so very very quiet, I guess he had startled people in the past.
I am sorta surprised that those things haven't been legislated yet....they can go pretty fast (I would guesstimate 40m/h) and they are pretty heavy (maybe 150lbs + the weight of the rider = 300lbs or so) yet there is no need for a license to operate one. I wonder if you even need a driver's license? I should ask one of those guys next time I see one parked...