Human inner subconciousness is nothing more than one speaking out loud. It's your inner voice yakking away. When people do that they have no idea that others are listening. It may not be something audible. It could be a gesture. Try staring at someone and watch what they are doing. They don't have say anything out loud. But their little gestures, like a frown or a shrug or a scratch, say something to us. What makes it funny is that we try to figure out what they are' saying' .