Luna yawned, stretching her legs as she lazily fell off of her bed, hitting her head in the process, and conveniently forgetting that she was wearing elephant boots, creating a massive commotion that all but startled Twilight and Celestia deep down underneath the castle.
How she slept while wearing elephant boots? Ask Discord. Even I don't know anymore.
"Celly?" Luna whimpered quietly, apparently forgetting about the fact that she had scared her sister off as well, "Where are you?"
She stared out the window, appalled by the sheer amount of... lava?
"MA QWEEN," A pudgy, squishy little red echidna cried aloud, "YU MUST LEAD DA WAY."
Luna stared at the thing with a confused face, before slamming her hoof on the Discord-provided short-term time-machine.
"SISTER." Luna shouted, slamming the door open, "I HAVE COME TO A STARTLING DISCOVERY, ONE THAT MAY CHANGE THE FATE OF EQUESTRIA FOREVER."
Celestia sighed, and turned to face her sister. "What is it this time, Luna?" she deadpanned.
"THE FLOOR ISNOT, IN FACT, LA--"
"NAY!" Future-Luna shouted, kicking the door open again, "NO. STOP IT. GET SOME HELP."
And that was how cotton candy was discovered.