I guess I would revert to my standard emergency procedure which mainly consists of running around screaming OMG, OMG, is there a pilot on board?  :o Must admit, it's even more likely to happen that all engines flame out and I start to wonder on why the plane is so amazingly silent on this special flight and, later, noting that the water does look closer as usual.  :-? I mean, you should stay calm in emergencies, right?