The camera catches David sliding his wedding ring off of his finger and into his pocket. Seconds later, the train gathers speed, and the passengers quickly realize something is terribly wrong. David looks out the windows and the background flashes to white. It doesn't take him long to recognize that it is the train his father was on. David awakens in a hospital room.
Blood seeps into the cloth, covering the victim.
He is the last victim of the accident. In a great moment of subtlety and authenticity, Joseph places his mother's hand into his father's, and as soon as his back is turned, they let go. Their relationship is obviously on the rocks. Film is primarily a visual medium, and in one simple shot, Shyamalan portrays their current relationship status more effectively than a thousand words could. Unbreakable is full of moments like this, where even words can not alone express the correct emotion.