Here is another snippet from my "Book of Lists".
It is from the section "Really Unusual Medical Conditions".
Officially known as ' Alien Hand Syndrome', this bizarre neurological disorder afflicts thousands of people.
It is caused by damage to certain parts of the brain, and causes one of a person's hands to act independently of the other and of its owners wishes.
For example, the misbehaving hand may do the opposite of what the normal one is doing: if a person is trying to button a shirt with one hand, the other will follow along and undo the buttons.
If one hand pulls up trousers, the other will pull them down.
Sometimes the hand may become aggressive - pinching, slapping or punching the patient; in at least one case, it tried to strangle its owners.
A neurologist says "Often a patient will sit on the hand, but eventually it gets loose and starts doing everything again."
Cut throat razor alert. Hope people with this condition use electric razors.