Setting: Shopping with my three oldest girls. Purchasing the "first deodorant" for the 2 eldest. (cue trumpet fanfare and pyrotechnics. These girls are EXCITED!!) The third born, 8 years old, is feeling left out.
8 year old A: Mom, can I please have some deodorant too?
Me: No honey, you don't need it yet.
A: Mom, please. I really want some. Why do they get it and not me?
Me: Honey, they are older. They need it, and you don't. One day you'll be older and you can have some too.
A: But Mom, I'm a big girl too. Why don't I need it?
Me: Honey, you don't need it because you don't smell.
A: (suddenly highly indignant) I do SO smell! My nose works just fine. I've been able to smell since I was born!
(mental note: Mom needs to remember to not speak in such a way as to confuse the literalist in the family...)