This is from an actual conversation.
Dad: [Name removed]! Can you come down now?
Son: Why?
Dad: To eat dinner.
Son: Why?
Dad: So you won’t be hungry.
Son: Why?
Dad: So you’ll grow big and strong.
Son: Why?
Dad: Because it’s fun.
Son: Why?
Dad: Because there is lot’s to do.
Son: Why?
Dad: Because it’s a big world.
Son: Why?
Dad: Because of gravity.
Son: Why?
Dad: No one knows why gravity works.
Son: (sliding down the stairs on his belly face first, like a skeleton rider.) Why is the sun on fire?
Dad: Because of the energy produced by the force of gravity.
Son: Are other stars bigger than the sun?
Dad: Yes, some are.
Son: How do you know?
Dad: Because scientists with big telescopes can look at them and use math to figure out how big they are and how far away.
Son: I knew that.
Dad: Then why did you ask?
Son: Because I like to.
Dad: Then you are going to be a smart man one day.