Yep, Pinkie's powers forced a deity to fall out of the sky midflight.
Life is simple: it has no nontrivial normal subgroups.
Celestia's all like: "SHIT I'M FALLING OUT OF THE SKY MAYDAY MAYDAY BETTER AIM FOR TWILIGHT'S HOUSE SO THAT I CAN TAKE HER WITH ME!"
What? A Princess can't go out and pick up her mail once in a while?
@Ed: Ironically, her presence makes Ponyville safer because scarier stuff doesn't come around more often to cause trouble.
Pinkie's ESP can summon the Gods.
But only on accident. She was really trying to summon the Stay Puft Marshmallow Pony.
Life is simple: it has no nontrivial normal subgroups.
@Lurker: Fair enough. She could've have tried for a softer landing though.
I reckon she should've just completely demolished the library, look around to see that she didn't manage to kill Twilight and is still alive, and run away really quick.
More like Petty Kamikaze Attack.
"Sunboom" rolls off the tongue a bit better.
Headcanon: the Zebraic language (and probably culture) encourages rhyme/rhythm, and speaking in poetry is considered a sign of class, education, and refinement. It's entirely possible to speak the language non-poetically, but you'd most likely be seen as a foreigner or a hick.
"I've come to the conclusion that this is a very stupid idea."
Zebras worship the ancient Sick Fire, which has burnt since the first zebra civilisation and represent their unity under the Flow.