Celestia: "Luna ... what are you doing?"
Luna: *flops down* "Well *pant* I was trying to raise the moon, obviously *pant*!"
Celestia: "... yeah, I can see that *giggle*. But why?"
Luna: "Remember how you told me that you got your cutie mark when you first raised the sun?"
Luna: "Well it's about time I get my cutie mark, so I'm raising the moon now! I even made it all by myself!!"