Ha! Exactly the same thing happened to me in March 1999 on JFK-LHR flight. When I returned to being conscious, I panicked at first because I couldn't remember why I was on a London flight (I was re-routed from a nonstop TWA flight to Madrid) or who I was with (two buddies). But then the really HOT flight attendant - with whom I had been trying to flirt before - tried to help me, and it all came back to me. The rest, as they say, is history.
(Ah, the days of my youth!)