Me, in the car, on the way to preschool: "Sethie, do you want to go to preschool this morning?"
Seth: "Yeah!"
Me: "Are you sure?"
Seth: "Yeah!"
Me: "Are you really sure?"
Seth: "Yeah!"
Me, realizing my giddiness at his new adventure is making me annoying, but I can't stop: "Are you sure you're sure?"
Seth: "Mommy, let's not speak anymore."