A plane teetered perilously on the face of a cliff after skidding off the runway while landing at a Turkish airport. Fortunately, the 737 wound up stuck in the mud, just a few yards away from falling into the Black Sea. It was nothing short of a miracle that none of the 168 passengers or crew was injured. The cause of the accident is still under investigation. Some reports suggest ice or a bird strike may have been to blame.