Just say yes

Brianna and her (younger and quieter) friend Evan were playing in our living room when I overheard this:

Brianna: "I'm hungry, I want some snacks. Do you want some snacks, Evan?"
Evan: (continues to play quietly)...
Brianna: "Evan, say 'yes'!"
Evan: (continues to play quietly)...
Brianna: "Evan, say 'yes'!"
Evan: "yes"
Brianna (running to the kitchen): "Mom, Evan wants some snacks!"