if there was one time I could take a piss and not have someone else stop by. It's not that I'm shy, but dealing with people all day makes one want a moment of peace and quiet.
Standing there and having someone else come in and go take a dump with noises like something from Dr. Seuss does not allow one to decompress. Nor is it possible when someone comes in and tries to talk to you (yes ladies, there is a code in the bathroom). Of course there's always 'The Whistler'. Annoying is the word that comes to mind.
Peace and quiet are one of the two reasons bathrooms exist. If only solitude would be a third reason.