seitora said:
What if one of the Mane 6 outside of Twilight got annoyed over Celestia sending Twilight a book without any warnings to the spell's effects at all and the fact that merely saying the words might set off the spell in Magical Mystery Cure? Don't really know where to go with this, just a thought.
I actually thought on this a little bit more.
MMC is a controversial episode. I don't like it all too much, but not because of the whole 'Twilight is Now a Princess' thing. I think what bothers me is the whole Cutie Mark switcheroo in this episode. The experiences of the rest of the Mane 6 where they struggle with their new Cutie Marks makes some sense to me - they aren't PASSIONATE about their new Cutie Marks, and they lack trained skill, both which result in the things like Fluttershy being depressed because she can't entertain anyone, Rainbow Dash almost getting boiled, etc. '
It feels kind of weird to wrestle down just how the whole function of getting a Cutie Mark is supposed to be, thanks to multiple show writers and internal inconsistency. Fluttershy and Pinkie Pie found theirs through an inspiring moment, but Rainbow Dash and Twilight got theirs through actual feats they performed. Applejack leans towards the former, while Rarity was more of a pre-existing interest in costume-making.
I'm rambling a bit here, but in essence, I actually find it a bit horrifying to think about what would happen if Twilight didn't succeed in setting the spell right. The Elements would go their separate ways, Twilight would know she had ultimately failed her friends. Maybe Celestia or Discord have a reset button, maybe they don't. What is interesting here though is that Twilight didn't know speaking the words in Star Swirl's book would do what it did, and given all the other spells we've seen in the series, that was the only time one activated merely through speaking lines.
In any case, Rainbow Dash is the Element of Loyalty, so I suppose she hears all this after the fact from Twilight after she resets everything, becomes a princess, and has a coronation. So she hears Celestia sent the book to Twilight, and boom, Twilight is an alicorn now. So Rainbow can think either Celestia knew what would happen but decided the Mane 6 minus Twilight having their Cutie Marks switched around was necessary, or she didn't know what would happen and was being irresponsible.
But Rainbow doesn't speak to Celestia. Instead, she talks to Princess Luna, former bearer of both the Element of Loyalty and of Honesty.
EDIT: For real nightmare fuel, consider that all the other residents of Ponyville didn't find anything wrong during the events of MMC, and for Rainbow Dash to actually be LIVING in Fluttershy's cottage and Applejack in the Boutique means that the reality-twisting went more than skin-deep. For even worse nightmare fuel, they might remember this alternate timeline. There's a fan-theory that the reason Pinkie was working at Sweet Apple Acres was because she was married to Big Macintosh
[img=400x400]https://derpicdn.net/img/2013/2/27/257084/large.png[/img]
Notice what she's wearing. It's not the Element of Laughter.
Or in a longer comic form