"What are you doing?"
"If you smile they give you their FOOD! And the best yummy things come from the table.">
"So you have to show your teeth??? I thought that was rude???" >
"Not to humans. They like to see teeth. It means they're happy. And then they give you yummy FOOD!!!"
"Hmmm....humans are strange."
"I'm glad I have a big sister to tell me the human secrets."
"Yeah, yeah, yeah...just try smiling and we might both get treats."