I saw this YouTube video in my Psychology class a few days ago. We are talking about brain function and the importance of the corpus callosum, which is the bridge between the left and right brain. It's what makes communication between the two halves possible.
This guy in the video, Joe, had severe seizures and to help get rid of them he has the corpus callosum snipped. Now his brain is basically two parts that are independent of each other. His left side and his right side can't communicate. This neuroscientist in the video does some interesting experiments to show how this affects Joe. Check it out: