"I think my new sunglasses look okay. They might be too big, though."
"I think you'll think all glasses are too big for your head. You have a puny head. It's like you stopped growing it at 'kid sized head.' * starts singing * I don't wanna grow up, I've got a puny head!"
"Stop it! I don't like being reminded about it."
"What? I have the opposite problem. I have a huge head!"