Dwayne, an emotionally disconnected character, is a follower of Nietzsche and has taken a vow of silence in protest against the world. He has the dream of becoming an Air Force pilot and in this scene, that dream is shattered, as you will see through your own eyes.
This is linked to ontology because it raises the question of, "What does my life mean?" In the context of the movie, Dwayne's life revolved around what he believed to be his destiny to fly jets. When that was pulled out from under him, it challenges his previous way of living. It even leads him to speak for the first time in years.
Check out the clip linked below and witness Dwyane's ontological crisis. Sit back and enjoy! (I apologize that I was unable to embed the video and that it is rather low quality.)