Etiquette Bell

If you're female, travel in Korea and use a public toilet you might see one of these on the wall :

If you press the button it doesn't chime but makes the sound of flushing water to cover any unladylike noises you might be making ! I took a photo of this one at Incheon airport en route for the Philippines, but you can see them in many public toilets. Here's another style found in a motorway service station