I’ve only been at work for an hour and twice already I’ve walked in on a coworker talking in an empty room. Now, one of them was probably singing a song. I can’t blame him for that. I usually have a song playing in my head when I’m working. It usually helps make the time go quicker. I, however, don’t do it out loud.
The other one was having a full blown conversation with himself and it scared me just a little.