Last week I had a man behind me who loudly talked about every airline crash in history. He started prior to takeoff and then commented during each interval of our flight about which point during our flying time that the crash had occured. How many seconds the plane had flown before going down, which plane part had gone bad, etc. He could not stop talking for 2 hours. I said a prayer for him because I decided he did this due to nerves.
PS, he was well dressed!