Today, before dropping Lu off at school:
BIG PERSON: "Let me wipe your nose. You have green boogers."
SMALL PERSON: "Nooo."
BP: "Dude, let me wipe your nose. Boogers are yucky."
SP: "No, Mom, boogers are yummy."
BP: "Um, boogers are yucky."
SP [shaking head earnestly]: "Boogers are yummy."
BP: "Yucky."
SP: "Yummy."
BP: "Yucky."
SP: "YUMMY!"
BP: "Okay, I give. Boogers are yummy."
SP [smug]: "Yep."