Sounds
It’s like a mix between a flushing sound and a fountain. It sounds terrible too, it’s super obvious you’re trying to be discreet about doing your business. In some toilets, the sound starts on its own as soon as your open the stall door, so at least everybody has the same background soundtrack.
Japan 20 years ago had sound machines wall-mounted in the stalls, and the English translation of the brand name was “Princess Sound.” Always found that slightly amusing
Haha!