In a fit of anger, Tempest Shadow destroyed Twilight Sparkle's friendship festival crown. But, in destroying so, she was forced to put up with the crown's spirit. Now travelling around Equestria, Tempest is once again visited by the crown's spirit.
Continuation of
"Grubber, I can feel myself slipping away
I can't remember what it made me say
But I remember that I saw you frown
I swear it wasn't me, it was the crown"
This feels more like a bonus epilogue for the mane story rather then being on it's own.
8988456 That's because it is
8988532
Whoops! What I meant was that it could have been posted as a bonus chapter from the mane story rather than a single one shot story.