Scary, shocking video of a man that jumps from a plane and then suffers a seizure, losing consciousness.  His instructor is able to deploy the man's parachute in the nick of time.

Mashable says it all started with a Reddit post.  The video went up and got "up voted" to the front page, but then was deleted.  Not a lot of information is available as a result, however, the belief is that this occurred in Australia with WA Skydiving Academy back in November.

The student, Christopher, began to seize as 12,000 feet.  Finally, at 4,000 feet, the instructor, believed to be a man named Sheldon McFarlane, was able to deploy Christopher's parachute.  At 3,000 feet Christopher regained consciousness and was able to land safely.