Wasn't there a QF B707 upset over India one night during the 1970's? That would have come close to a disaster, I would think.
Crew rest.
My very imperfect memory of that event (I am sure someone with better information than I will correct me) was that a gyro (or something similar) stopped working in the autopilot of a 707 somewhere over the middle east. The aircraft pitched nose up very rapidly and the airframe suffered from being overstressed. The crew made an emergency landing. I thought the airframe was written off but I cannot be certain about that.