Many years ago a man I knew, was flying one of HM's Canberras up over France.
The seat was unbelievably uncomfortable for even short periods and after several hours Russ was in considerable pain from a numb bum. With the auto pilot engaged he slipped the ejection seat pins back in, undid his harness and somehow managed to manoeuvre his body around so that he was kneeling on the seat facing the tail. In this position he was able to massage his backside to get the blood flowing again and reduce the pain.
...and that would have been the end of the story had he not then noticed a French Mirage fighter sitting on his wing tip staring incredulously at the sight of the rearward facing pilot. He gave him a timid wave and received an enourmous Galic Shrug in return.
He took heart in the fact that no one would have believed the French guy when he got back to base.