Observation

Owen, while seriously studying Noah's face:
"What is that funny thing on Nosy's chin?"

Mommy, not quite sure what O is referring to:
"That dent in his chin, O?"

Owen:
"Yes. What is that?"

Mommy, laughing:
"It's a little dent. That's how God made No-nos."

Owen, with a very puzzled look on his face:
"Like the dent in his bottom, Mommy?"

Mommy, really laughing now:

"Well, kind of like that O..."