)
This is Equestria. A sudden fart influx is invariably a sign of dark anti-friendship magic and may even warrant a two-partner.
Fiber Brox, dark wizard of eons past, master of cabbage and legumes, has returned from his slumber. The mountains rumble and a hideous miasma coats the land. The citizens hack and cough, their breath stolen from them. Canterlot Castle is consumed with a vile aura and none can approach. A slightly impressed "God _*damn_*, Luna!" can dimly be heard from within the mist.