Storytelling game on my status! One day, Rarity fell asleep on a bench. When she woke up, she had shrunk to a quarter of an inch tall. Rainbow Dash sat on her. Rarity was now stuck under Rainbow's rump. Suddenly... *FART*
Suddenly, for no reason, Fluttershy was a pony again. "Well, it's good to be back... but my stomach feels strange... like there's something disgusting in it..." she said. Then she noticed Pinkie was wiping her hiney.