Last month when we were in Vermont I was taking pictures of Brattleboro. And I stepped off the sidewalk for a better camera angle when I barely heard this anemic little beep-beep. I backed up and looked for a car but couldn't see one.
So I went back into the street and got beeped again, this time as some Harleys were riding by. So I smiled & waved, thinking maybe they were just saying hello, bike horns often that weak. But as I continued taking pictures the honking became incessant. I finally realized it was coming from a car parked on the curb, whose bumper was about 2 feet from me, but which I never touched.
It was some older compact, didn't recognize the make, not in very good shape, but apparently had a proximity alarm installed. With the most pathetic horn you could imagine for a car, so weak I could barely hear it that close. And what a public nuisance, that you weren't supposed to pass by closer than 3 feet of this gem.
I returned to the sidewalk to let it finish about 30 seconds more of its imitation of a dying duck, before it finally stopped. Or maybe did die, I'd have certainly been pleased if at least the battery had.