You would think that in a country where talking aloud in the subway is barely tolerated and speaking on your cellphone strictly forbidden, there would be some sort of strict control on what you can do with a speaker-equipped van.
Oddly enough, it is absolutely OK to blast your loudspeakers in the early morning or late evening and drive around the block, repeating the same recorded message or playing the same tune over and over and over again.

It can be anything from "the garbage truck is coming, the garbage truck is coming" to "sweet potatoes, who wants hot sweet potatoes", along with a strange song which I first thought was some kind of religious chant or something.
But the top-annoying one for me is the
Yonaki-soba (soup noodles) selling car, that usually comes on Mondays
LATE in the evening. In the old days, 150 years ago, it must have looked something like this picture, with the seller playing the
shawm(charumera) to announce his arrival.

Nowadays the "melody" is recorded, and it goes like that:
http://www.geocities.jp/numabe_tama/Raamenya.mid (sorry, I couldn't link it properly). Take into account that it takes about 15 minutes for the car to pass, and you can calculate the number of times you will hear that tune.
I wonder who is eating soup noodles at 11 pm anyway...