Dear Princess Celestia,
Today I learned how there are many uses to one thing. For example, I don't have to only use my horn for magic, I can also poke other pony's rear ends with it! Secondly, I also learned that, even if you are friends with a pony, they may not like you poking their butt cheeks with your horn. But sometimes, you have to disrespect your so called friends and continue poking their ass anyways since it's tons of fun!
Your faithful student,