- Arthur: [DW is running to get into Arthur's tent but Arthur stops her] No, you can't come in.
- D.W.: Why?
- Arthur: Because.
- D.W.: Because why?
- Arthur: Because because.
- D.W.: Because because why?
- Arthur: Because because because.
- D.W.: Because because because WHY?
- Arthur: Because... because... uh... because
- [Brain whispers in his ear]
- Arthur: Because you'd get scared of the dark!