Pinkie's character/ancestor/probably just character said that there is no up or down.
I hypothesize that this complete understanding and unfaltering faith of reality allows Pinkie to tap into her toon-like powers.
And with that, have some Pinkie on Pinkie action.
@Connor
If the creators are anything like me, then they probably don't spend time on fanfiction. It takes a long time to read some of the longer ones, and they have full-time jobs along with family and friend roles. They probably know about the art, some music, and maybe some comics. But nothing with a detailed story.
I'll give you that they some animators may have read some shorter fanfictions, but that's a "may." I doubt anyone determining a story would even stray the way of the fanfic. Faust may be more likely than Thiessen now since she's not the head honcha, but I think Mrs. Faust has her own headcanon about the show. She (within her right) probably doesn't want to see too many deviations from her original universe.