I have heard about this along time ago: Japanese women often flush the toilet as soon as they enter the stall to mask the embarrassing noise people naturally make when in the bathroom. This act of civility turned out to waste a lot of water resource. At first, they tried sound machines with music, etc., but still did not see significant reduction in water usage. Finally someone (or some company) came up with the idea of duplicating the sound of toilet flushing. This time, success.
I have always wanted to see one and after so many years, finally saw one in the luxurious restroom at the Takashimaya Department Store in Taipei (which also has the bidet-toilet seat…)
I only took a picture of it (while fully clothed mind you!! Was just there to take the picture…) But someone actually videotaped it here on Boing Boing. Glad to know I was not the only one fascinated by this thing.