DD3: "Why did the cashier person ask the lady where she was from?"
Me: "Oh, because she was visiting from another country and he was making a conversation."
DD3: "I know that, Mommy. I want to know why he had to ask. She was from Australia. She sounded just like (one of her classmates)'s mom."
Me: "Well, but what if she wasn't? When you make a wrong assumption about their background, people could get offended."
DD3: "Offended? Why?"
Me: "If people thought you were from Jupiter, wouldn't you be offended?"
DD3: "Why would anyone think I'm from Jupiter? There is no air for me to breath or water for me to drink."
Me: "Oh never mind."

My head hurts.