* They are also the perfect excuse for taking a sick day when you're not sick. Because you can't send them off to school, creche or kindy can you?
* And when you're coughing and spluttering at work, getting glares from your fellow workers, and you can't take a sick day because you've used them all up on the children, well, you can always blame the nippers for giving you the sickness. Though don't expect that excuse to appease your co-workers much.
* And finally, kids are the perfect excuse to jump queues at the airport, or any other place where you have to line up. "Do you mind?" is all you need to say, and people are - usually - obliging enough to let you go ahead.
The prime minister's predicament also got me thinking that just because kids do something or say something, doesn't make it ok for a grown up. I guess that's why there is that famous saying, "Kids say - and do - the strangest things". Adults should know better. But I admit it - just like our great foot in mouth disease leader - sometimes I can't help but be a big silly kid too.
For example, even though I tell my little girl Mia not to lick her knife or pudding bowl, I'm still prone to the odd knife lick every now and then. But I wouldn't do it out in public, or, in the prime minister's case, at a state dinner or something.
And I tell ya, when I don't get my way I'd love to roll around on the floor, kicking and screaming. But I don't. Although Mr Key should try it in a press conference next time he gets asked a curly question. The nation will think he's lost the plot, but it might get him off the hook. Because after all, he likes to think he's down with the kids.