Celestia was having a great day. Then she is sent to a world where Twilight Sparkle is the princess and Celestia is the student! Celestia finds exciting and slightly horrible.
This is from Celestia's POV.

The Doctor goes on an adventure to the past. Celestia and Luna's past. How exciting!

Then, something goes horribly wrong. But, still exciting!

Twilight's hungry.She wants a sandwich.Couldn't be too hard.Can it?Twilight will do what ever it takes to get a simple sandwich.