Guess they put on the wrong tape. From AP:
Passengers on a British Airways flight from London to Hong Kong were mistakenly told to prepare for a crash landing, causing panic onboard. The carrier said Friday it had apologized for causing customers distress after an emergency message was accidentally triggered. Passengers were warned during a flight Tuesday that the Boeing 747 may crash into the sea. They heard the message: "This is an emergency. We may shortly need to make an emergency landing on water." Michelle Lord, who was onboard, told Britain's The Sun tabloid that her fellow travelers were deeply frightened when the taped warning was played over the airliner address system. "People were terrified. We all thought we were going to die," said Lord, 32.