At a big conference a few and more years ago, a colleague of mine came back from the loo to where we were all sitting and said that whilst sitting there, someone hurriedly crashed into the main loo, went straight to the cubicle at the other end, locked the door and promptly started up something that buzzed furiously.
About a minute later, the buzzing stopped, the bolt slid back and the mystery person left in just as much hurry.
Us blokes naturally spent the rest of the day trying to guess as to who it might have been.
Oh my. That certainly beats a bathroom talker.
Bathroom talkers are a phenomenon of every office! Here where I work we have the most private conversations happening in the kitchen... more risky but it's better to whisper near the coffee machine than the toilet