2. Alien Hand Syndrome
This condition is also called Dr. Strangelove Syndrome, named after the character in a 1964 film depicting uncontrollable hand movements, notes EveryDayHealth.com. It makes it seem like an outside force is controlling one of the patient’s limbs against their will.
“From time to time, when the other hand is engaged, the affected hand may hop in and try to interfere with that hand or do something counter to it,” notes the source, who cites a neuropsychologist familiar with the condition. This condition can be the result of medical trauma (such as a stroke) that affects the connection between the brain’s hemispheres, it adds.