Why was pinkie farming rocks anyway?

Why was pinkie farming rocks anyway? is an animation featuring Pinkie Pie. It is set to the song "Waltz de Chocobo" and takes sound effects from Valve's Team Fortress 2.

Pinkie Pie is strolling through the forest when she comes across a pile of rocks. Rarity and Rainbow Dash spy on her from behind some nearby bushes. Pinkie Pie then eats one of the rocks, before pooping out a perfectly brand new gem. Rarity is angry about this discovery.