"I still can't see it."
"See what?"
"You as Celestia, I mean, how could you be Celestia?"
"Would you like me to transform back?"
"Oh come on, you know what I mean."
"Scootaloo, I like to relax and play practical jokes on others. I just do what I do because I happened to be the most responsible and concerned pony in the room at the time."
"So you're the princess because nopony else is the princess?"
"Yes."
"I can't really see that."
"So, you wake up one morning."
"Okay."
"Everything's good, everything's fine, you go out and you grab the newspaper."
"I don't read the newspaper, but alright."
"Turns out they discontinued the color brown."
"...What?"
"Color brown, no longer using it. No longer allowed."
"So uh, what about naturally brown stuff?"
"Comes out in shades of gray."
"You know, I could totally see all the rich snobby Canterlot ponies spending a million bits over authentic brown poop. I can see it now, brown wrapper that was thrown off the side of a ship found at the bottom of the sea, they spend a million bits to try and recover it..."
"Dirt stains on clothing is only worn by the highest social class."
"You just want an excuse to look dirty all the time don't you?"
"Worms are hunted to extinction because they eat brown dirt and poop out gray dirt. Farms are destroyed and the planet is ruined because everypony is hording dirt."
"I don't think anypony is that crazy."
"Turns out an undiscovered pony civilization used brown paint for rituals and ceremonies. They're completely killed off out of frustration by the rest of the world."
"What does this have to do with you being Celestia again?"
"Okay, so new scenario."
Sigh
"You wake up, and everypony in Ponyville is like a balloon, where they float off into the air and eventually pop."
"What."
"They float off really slowly, so you could go around town pulling them back down all day if you want. Do you?"
"Well, yeah."
"You wake up the next morning and it's the exact same thing, all slowly floating off, what do you do?"
"Nopony, this is stupid."
"You wake up the next morning and Sweetie Belle and Applebloom are dead."
...
"Back then, the tribes were united but not at peace with each other. They squabbled over the silliest things. I had a way with words though, and I could usually stop anypony from doing something rash. But it was something I had to do everything single day. One day I grew tired of it and said they could work out their own issues. The next day a lot of ponies I knew since they were born were dead."
...
"What did you do?"
"Helped them out until I was too frustrated, and woke up the day after to a lot of dead ponies, again."
...
"Eventually, things calmed down enough that I could go off and have time to myself without everything falling apart."
"What happened then?"
"Discord discontinued the color brown."
...
"I'm sorry."
"Don't sweat it kid, I'm fine."
"...So, I can see why you were the way you were back then, but why are you doing all of... 'this' now?"
"Oh, that's easy. With the addition of a certain purple alicorn, I'm not the most responsible, concerned pony in the room anymore, am I?"