Princess Celestia was sitting in her room. Then a letter arrived for her. She opened it up and started to read it:
Dear Princess Celestia,
A few days ago Twilight and I got into a fight. It caused her to mess up a spell and it made us switch bodies. It wasn't too long until the others switch too. We have a learned a lesson from this little mix up (me especially). I learned that to be a good friend is to always be kind and caring to your friends. Even if you're angry at your friend. If your friend is in a jam never remember the fights, think about your friend.
Your faithful subject,
Rainbow Dash
Princess Celestia put down the letter and smiled. She was remembering a fillyhood incident somewhat like this. It just made her happy.