When a party distracts Pinkie from keeping her dates straight, Pi Day nearly sneaks up on her, leaving her unprepared to deal with the effects of the dreaded Pie Family Curse. 
This ends up having disastrous consequences for Ponyville, and as usual, Twilight and the rest of the Mane Six have to deal with them- but this time with a little help from the Doctor and Ditzy!
Of course, things probably would've gone more smoothly if Discord hadn't shown up.
*Kind of a crossover if you count Dr. Whooves as being separate from the MLP universe.
Chapters (1)
Ha, I loved this story!
Interesting concept and exceptionally original plot, the characters are portrayed well, and this story did its purpose; it certainly made me chuckle a bit! However, I advise that you space out each paragraph for every time a new character speaks or if, obviously, a section of detail is getting too long.
Like this.
Also, one more thing, that letter Princess Twilight sent to Princess Celestia really bugged me out. To quote from Twilight Sparkle herself in Magical Mystery Cure:
Yeah, so shouldn't she be writing in the Friendship Journal or something like that?