Twenty years ago I flew with a very clever RAF navigator - I found out he had in fact written much of the information contained in the Navigation part of the RAF's Air Publications.
One day, he mentioned that he had once been a trainee RAF pilot but had withdrawn from training. Another time, after a few beers, he told me why.
He was night flying the Balliol T2 trainer (Merlin engined) when, during a low and slow go-around, it did a 720 degree torque roll for him and scared him half to death, although he escaped without crashing. He decided that someone was telling him something..