From her bathroom: "Ew."
Me, calling from my bedroom: "What, Lu?"
Lu: "Nothing."
Me: "Why did you say 'ew'?"
Lu: "Something smells like butt."
Me: "What is it?"
Lu: "My butt."
Me: "What does it smell like?"
Lu: "Butt."
Me: "Do you need help with something?"
Lu: "No."