As told by Grandma... (or at least my recollection of the story)

Grandpa: Julia, can you say Grandma?

Julia: NO!

Grandpa: Can you say Grandpa?

Julia: NO!

Grandpa: Can you say Sharon?

Julia: NO!

Grandpa: Can you say no?

Julia pauses.....thinks a bit....then gives her trademark answer: Uh-huh.