During Charles Krauthammer's first year of school at Harvard, while he was skipping class to play tennis with his friend, he dove into a pool after the game to cool off, and he broke his neck. This accident resulted in him becoming a C5-6 quadriplegic, and he has been in a wheelchair since that time.
In a Fox News reporting special, Krauthammer detailed the specifics of the incident where he became paralyzed when he was only 22 years old. At the time of his injury, he recalls skipping the morning classes to play tennis with his friend. When they were done with their game, they were on their way to the afternoon classes and decided to take a quick swim first. Krauthammer said that they took a few dives into the pool, and he hit his head on the pool's bottom.
While he hit his head, there was no sign of trauma on his head itself. The impact concentrated all of the force to a specific spot on his spinal cord, which resulted in crippling damage to his cervical vertebrae. He was unable to move from the bottom of the pool. Ironically, at the time of the accident, he was studying about the spinal cord in his classes.