In 1983 a 19-year old boy named George suffered from extreme obsessive compulsive disorder (OCD). His case was very severe that he had to quit school and job. Also he had to wash his hands hundreds of times everyday and take excessively frequent showers.
George tried to shoot himself in the head to end this miserable life but he missed! His shot actually hit the part that controls the obsessive behavior in his brain (left frontal lobe) without causing any damage to other regions. So after this "failed" suicide attempt he was cured from OCD.
He was interviewed five years later after this event, he found a new job and he returned to college where he was a straight A's student. His IQ did not change but he just got rid of the OCD.