…Like, for example, it getting replaced with a princess of the night that was just about to head for bed herself! Total blame for this can be laid on Celestia, but Pinkie not noticing the massive balloon she was filling suddenly gaining a mane, cheeks and starting to wriggle about in her grasp is definitely the fault of the pink party pony.
Or, maybe she knows exactly what she’s doing~
Remake of an old pic of mine, that I’ve sen get a bit of proliferation around the web.