"Mommy, I'm going to run away to South America and live in the rainforest." (arms crossed, brows furrowed, pursed lips, mad face)
Me- "You are? What will you do for food?"
"I'm going to eat fruit off the trees there."
Me- "Oh, ok. Well, what about on the way there? What will you eat then...and how will you get there? Walk? That will take a long time to walk the whole way. Where will you sleep?"