My wife was in labour when the nurse said it was time to push.
She gave it everything she had, until a fart, that from sound and stench, had obviously followed through. She was mortified.
"Don't worry," i said, patting her head. "I've heard this kind of thing is perfectly natural during birth. Isn't that right nurse?"
"Yes," said the nurse gagging, "But it's usually the mother not the father!"