When I used to have a LHBS I would call in with my daughter when I needed to pick anything up. Once we called in to get some grains and there was another customer standing at the counter chatting to the owner. I had a quick browse whilst they talked and it was obvious the guy was a noob. Anyway, after a few minutes, the owner said to the customer "Can you excuse me a minute, this guy (me) will only take a second to serve- he'll be here for his grains"
We went into the grain room and the little one stayed by the counter. When we came back through a minute later I heard Niamh saying to the guy "... And this is an airlock. You'll need one of these because the yeast fart co2 and wee alcohol so the co2 needs to escape. And this is a thermometer you want it because ...etc, etc" Whilst he nodded and took the stuff off her and put them in his basket.
I couldn't stop chuckling all the way home and the owner later told me that the guy had been unsure as to whether brewing was something he'd get the hang of but after we left had said "if an 8 year old girl can figure this out I'll give it a go".
I should have got her on commission