Have you ever noticed how some people have a tendency to talk out loud to themselves?

For some, it's just a whispered mumbling or silent mouthing of words as they assemble their new IKEA bookshelf. For others, it can be a little more overt, and take the form of louder and more colorful language, as they discover they've purchased the most inexplicably complex minimalist bookshelf that IKEA has designed yet.