Shower Thoughts: Why do we still need witnesses at weddings?

Have you ever been standing in the shower, when suddenly, the noise in your brain clears and in its place appears the perfect thought?

That's a Shower Thought, and RNZ's Nights is aiming to answer those unshakeable questions lurking in the back of your mind.

Tonight's question: Why do still need witnesses at weddings? 

To help us answer this questions we've enlisted the help of Celebrants Aotearoa president Rachel Clarke.