Clarke Gayford schools Baby Done stars Rose Matafeo and Matthew Lewis on parenting

There are some parenting revelations that you simply can't appreciate until you have a child - and to the untrained ear, they can be fairly horrifying. 

That's a strong theme in new Kiwi film Baby Done in cinemas Thursday, starring Rose Matafeo and Matthew Lewis as two nervous soon-to-be-parents without much of a clue. 

To mark the release of the new film, Clarke Gayford - New Zealand's 'First Man' and father to two-year-old Neve Te Aroha Ardern Gayford - gave the stars a series of hypotheticals about parenting, revealing some pretty intriguing things about their future parenting styles. 

The curly questions given to the unprepared duo tested their knowledge of 'Witches Milk', the fontanelle and navigating nappy changing. 

"How do you prevent your kid from peeing on you when you've just changed their nappy?" was one of the questions Clarke hit the bewildered pair with, with possible answers including simply not changing the nappy, wearing a hockey mask, or just not ever having a kid. 

"All of the above," seemed to be the definitive answer, although when Matafeo mused she had never been urinated on by another person, Lewis revealed he, in fact, had. 

Gayford also explained a horror scenario with a baby involving a "poo explosion", the baby's hand and their own mouth. 

"It happens, oh it happens," he told the shocked duo, before broaching another scenario familiar to many parents. 

"Your two-year-old walks in on you having sex, what do you do?" he questioned. 

"I congratulate myself on having sex when I have a two-year-old," Matafeo replied. "Thats awesome."

Gayford offered several solutions including "hiding under the sheets and hoping they go away", "telling them you're making a new baby to take their place", or C - "don't have a kid." 

"It's always C," Lewis responded in apparent shock. 

To see the full hilarious interview, watch the full video above.