I was out walking with my 4-year-old daughter. She picked up something off of the ground and started to put it in her mouth. I took the item away from her and I asked her not to do that. 'Why?' my daughter asked. Because it's been on the ground; you don't know where it's been, it's dirty, and probably has germs,' I replied. At this point, my daughter looked at me with total admiration and asked, 'Mum, how do you know all this stuff? You are so smart.' I was thinking quickly and replied, 'All mums know this stuff. It's on the Mum Test. You have to know it, or they don't let you be a Mum We walked along in silence for 2 or 3 minutes, but she was evidently pondering this new information. ‘Oh....I get it!' she beamed, 'So if you don't pass the test you have to be the dad.'