To the cranky old lady at the passport office when we turned in our applications: "Why are your teeth yellow?" (And that, my friends, is the reason we still don't have passports five months later...)
To me about a lady in the post office: "Mama, is that a girl or a boy?"
To me about a different lady in the post office (same day, she was really on a roll): "Mama, why is that lady chocolate colored?" (And that is why I wish I had a little kid shock collar.)