Okay, now that I'm not sleepy anymore I get it: Pinkie pranked 5/7 of her best friends.



Starlight had her hair annoyingly resyled, Rarity had her cutie mark removed, the pages of Twi's book were all loosened, Applejack drank from a mug with a ring around its rim, and Rainbow drank...something other than cider.



So Fluttershy and Spike are off-limits.