That's not actually true. I've had an egg roll out of the pile not once but twice and had to return it to mom's coils and it hatched out without any trouble.
There was also an experiment carried out on eggs to see what effect this had, if any, on the embryos growing inside eggs that were turned at different times during incubation.
http://ball-pythons.net/forums/showt...Egg-Experiment
Not trying to burst your bubble but I've seen people get so panicky just because they might have accidentally turned an egg one way or another and think they've doomed the baby. Just one less issue to fret over with eggs.