Here are my contributions from personal experience.....
Post C-section you'll have the worse flatulence of your life!
Post vaginal delivery the midwife will stick a finger up your bum to check she hasn't sewn you together. Even more alarmingly rather than thinking wtf! you'll hardly batt an eyelid!
AND THE MOST REDICULOUS THING READ IN A CHILDBIRTH BOOK
Ex. Miriam Stoppard that when the baby's head is crowning you should relax your perinium ! Personally I didn't have the mental faculties left at that point to relax anything!