From the hubro, discussing the automation of public toilets

If you turn off the lights in the toilet when someone is there, then within a second the “ei” will sound from the inside.
YYY: What if there is someone very shy there?
XXX: A shameful cough?
yyy: It must be a very loud shy cough. Preferably, with a shy comment "Who am I shy of coughing here, fucking?"