7. You Are Two Brains In The Same Head
So your brain is split into two hemispheres. Whilst the idea that one side is devoted to creativity and one side to analytical thinking is a load of foisty hogwash, those hemispheres are less like two halves of one whole, and more like two totally separate brains.
The hemispheres of your brain are linked by a bridge of nerves that allows them to cooperate and act as a single unit, but when the bridge is cut (which it used to be as a cure for epilepsy), things start to go wrong. People who have had this procedure found that their seizures stopped but that the sides of their brain began to behave independently and even sometime disagree with each other.
The right side might pick out a shirt to wear, whereas the left side might try to dress you in a dress.
Even creepier, only your left brain has the ability to talk, as that is where the speech centres are located. This means that you can show the right brain a word or object, but when asked what you saw, you will reply "nothing" because left brain didn't see it. The right brain, however, can still respond to commands, so it is clearly thinking, just mute.
This all rather leads us to the question of which, if any, is "you"?