Date: 2005-07-12 12:14 am (UTC)
Here we go (now that the kids are asleep):

"It seems that Japanese women, like myself, are ultra-paranoid about hearing the bathroom noises of strangers—and they used to waste millions of gallons of water each year by running the sink taps while otherwise engaged. Therefore, many “conservation” toilets in Japan now come equipped with noise-maker buttons. For birds, press one. For waterfalls, press two. For bulldozers, press three. And so on."

And some fuller descriptions:
http://metropolis.japantoday.com/biginjapanarchive349/323/biginjapaninc.htm

And more than you ever thought could be done with the intersection of high-tech electronics and toilets:
http://www.answers.com/topic/japanese-toilet
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