I can't stop thinking about this:
In some split-brain patients, or in others who have suffered damage to the corpus callosum, the right hemisphere seems to be actively fighting with the left hemisphere in a condition known as alien hand syndrome. In these cases, one hand, usually the left, acts of its own accord and seems to have its own agenda. The alien hand may pick up a ringing phone, but then refuse to pass the phone to the other hand or bring it up to an ear. The hand rejects choices the person has just made, for example, by putting back on the rack a shirt that the other hand has just picked out. It grabs the wrist of the other hand and tries to stop it from executing the person’s conscious plans. Sometimes, the alien hand actually reaches for the person’s own neck and tries to strangle him.
Jonathan Haidt, The Happiness Hypothesis
So strange. Sometimes I think we understand more about the entire universe than we do about our own physiology.