What caption would you put on this picture? This picture taken by Alan Cross and published to Instagram has gone viral. The two Singapore Airlines flight attendants sit calmly after being ordered to their seats when their Airbus A380 (registration 9V-SKH) encountered severe clear air turbulence 90 minutes into a Singapore to London flight on 26 May. Behind them is a scene of devastation. Breakfast was just being served when the plane dropped 100 feet. Eleven people had minor injuries as a result of the turbulence. The flight SQ308 continued onto London and landed safely…