Pinkie comes upon a method to help her arguing friends make up, they just need to see everything from the others viewpoint.
And so Zecora gives Pinkie a potion that will make everything better.
For the Mane Six, the rest of Ponyville... maybe not.
[Surprise, double feature! A second longer story coming your way, I wanted to post this ASAP since it needs commenter aid to progress, I fear that my promised stories will take some time to arrive, but I will make you all more stories I've been itching to make while we wait, enjoy!]