A compliment you'll rarely hear

I was talking with the 5th grade teacher the other day when two of her students walked up to her.

girl to 5th grade teacher: "You're pretty."
teacher: "Thank you. You are pretty, too."
girl to me: "You're pretty, too. You have purple-y glasses."
me: "You have purple-y glasses, too! How nice!"
other girl to me: "I like your teeth."