"Ladies and gentlemen, this is a recorded message. Welcome on board this fully automated, pilotless aircraft. We understand that some of you might be feeling a little nervous about this potentially ground breaking, new era of aviation. Please be assured, nothing can go wrong. The aircraft has a full backup facility in case anything should go wrong......go wrong......go wrong.... BEEP!".
"Ladies and gentlemen, we appear to have a minor problem. Our main flight computers seem to have frozen. The backup facility will now be initiated. Could the passenger in seat number A1 open the small panel on the wall directly above the entertainment screen and press CONTROL, ALT, DELETE."