Caporegime
Proud to say NEVER.
But I think it's so they can lock the door so no one disturbs them, or something.
Former friend of mine showed me a photo she'd taken of herself while in the bathroom. She forgot to flush
There are some on Facebook where a friend was still sitting on the loo with her knickers round her ankles. She seemed happy for the photo to be taken though as she had this big smile on her. The girl who took it was in the cubicle with her.