Dear Princess Luna,
You are the magical equivalent of a creepy girl who can't keep her nose out of anypony's dreams! It's because of you I sleep with a tinfoil hat, because otherwise you might invade my sleeping mind without my consent and see my innermost private dreams. I hope you accidentally wander into one of your sister's dreams, because given how juicy her secret diary is you'll learn a thing or two, and maybe you can finally get laid!
Yours sincerely, Discord.
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Dear Discord,
The tinfoil hat doesn't work. Just remember that the next time you go to sleep.
Princess Luna.
Hey something replied. Congrats Discord.
I want to see Gilda's letter next.
Welp, time to sleep under twenty feet of lead.
Oh wait, that's radiation.
On that night, Princess Luna tried to enter Discord's dreams, only to be chased off by an extremely aggressive tinfoil hat that wouldn't stop to try licking her face and duplicated whenever she blasted it with her magic.
OOOOH!
5901134
"Dear Derpy Hooves,
When you decide to stop burning my letters, don't do it when I'm insulting the pony goddess of dreams, you vindictive whore. You know why your eye is fucked up? I went back in time and made it so one eye will always try to look up your own ass. Suck on that, bitch.
Yours sincerely, Discord"
5903852 That's a bit, extreme.