Twilight Sparkle was crying. She didnt even know why. She woke up that morning and felt her eyes swimming in her olfactory juice, and just let it all go. Soon Vinyl Scratch, her next-door neighbour who was used to drowning her tears, also began crying. They cried and cried all day. They passed through the marketplace and cried. They met up with friends and cried. They passed the desire to cry to their friends, who in turn passed it on to their friends, who traded tears for fears and poison for black velvet.
A queen walked up and cried tears of pure bohemian rhapsody while Ozzy Osbuck departed in tears from Applejack's house on the crazy train. She was crying, too, though she didn't know why. Ozzy had passed by Twilight on the way to her house and had been happy as a clam. As soon as he saw her, he began to tear up. He had to get away. Everyone had to get away. Nopony could stay in Equestria anymore.
No. Nopony was in pain. Nopony had anyone to blame. They just felt like crying.
Oh, wait. They had a reason.
An army of red and black Gary Stu OC alicorn kings and queens from the backside of the underbelly of brony literature had suddenly taken residence in their happy town. They all cried, and because they weren't accepted, they vengefully casted their magic on anyone else who passed by, making them cry as well. The tears flowed freely throughout the land. Even Equestria itself, casually banging with an also-crying Cloud Kicker, was crying. As such, Cloud Kicker died in the middle of her ultimate climax.
That didn't stop the country or Cloud Kicker's corpse from crying.
Soon the country was flooded with tears, and everypony died. The ponies and the bronies, however, were taken to a far away land flowing with milk, honey, sausage, cheese, coconut milk, demon's breath, blood, and whitewater rafting. They eventually coalesced into humans. Six-hundred-thirty-two of these unfortunate souls were cast upon these shores and given various powers by Din, Farore, and Nayru, otherwise known as Celestia, Luna and Cadence.
Five hundred years later, a boy fell asleep on top of a spire at the edge of a town, beginning the adventure we all know as "Wind Waker". Canon story be damned.