Well the ones that had crashed over the years with unknown reasons given could had spun out of the sky. Any aircraft can go into a spin for your information.
In this decade there was the case of China Airline jumbo going into a spin dive and recovered with a twisted tail.
Singapore Airline jumbo had 3 jet upsets in 1996,1997 and 1998 though not much publicity was given to it for obvious reasons. They were trying to catch flight levels too early I suppose.
Well it's nice NOT to know but if it ever happened to you....what do you know!