My ponified version of the French web show "le visiteur du futur", with Future Twilight in the main role.

It was one or thirteen o'clock and basically the very beginning of afternoon at the farm, by the buckets of fruits and the barns with chimneys. They were set past the pumpkin field playing horseshoes and thus far the pegasus was leading.

One pitch over the fence and one horseshoe left, "I still have the closest throw!" The fiery blue mare said with pride. "Just try and beat it."

Applejack took a glare at her remaining shot, picked the shoe, snorted and got interrupted by a blinding ball of thunder. When it finished, both mares saw their friend Twilight in a torn leather suit, her mane ruffled, eye patched, a bandage on her forehead and the scar on her cheek.

"By all means!" She desperately yelled while jumping in front of Applejack: "Don't throw that horseshoe!"

"Nice to see ya Twilight!" The brave mare answered. "Wanna play with us?"

"What's with this outfit and all?" Dash loudly wondered.

Twilight stopped, looked at her messy dark hair and brushing them a bit, alas in vain: "Oh, that." She stressed with a smile. "I guess those past next days were a bit hectic after all… which reminds me" and she yelled: "Don't throw that horseshoe!"

"But why?" The cowmare asked, at a loss, the horseshoe back between her teeth.

"Thank you for asking… Because if you throw that horseshoe, this! is what happens!" Both mares paced back at her yell. "The horseshoe will hit the stake and you'll win."

Twilight then looked at her two friends, a quiet smile on her face as they recovered from the idea. Dash crossed her arms in disbelief as the farm mare, raising her hat, approached her studious and magical friend.

"Uh…" she hesitated. "It's kinda the goal?"

"Yes!" Twilight answered. "But then Dash's self-esteem will be crushed, she will feel humiliated and will challenge you to a competition! You will accept but she will use her wings so you will defy her to race in the Running of the Leaves where your eagerness to win will make you both cheat and ultimately prevent all leaves from falling off the trees!"

As their friend was catching back her breath Dash grunted, but Applejack felt bad. "Well I didn't kno-"

"I haven't finished!" The unicorn cut her. "Because then you'll learn a valuable lesson about friendship and you will gallop together to make the last leaves fall and it will be the best Running of the Leaves from pony's memory!"

"I uh great!" Applejack shook her head, a bit disconcerted. "So I throw it!"

"Nooooo!" Her friend's hoof poked her snout. "Because ponies will get so inspired by your excelling spirit that they will follow your example and competitions will spark all over Equestria! Thousands and thousands of ponies will race each other on a daily basis, so much that their hooves will get hurt, making horseshoes a fashion again, everypony will wear them and they will wear them out so much that in seventy-two years and three months exactly not one horseshoe will be left to play horseshoe pitching!"

She paused again, as if exhausted by her long sentence. "So?" The blue pegasus asked, not really impressed. "It doesn't sound that horri-"

"Also!" Twilight panted, took the sweat off her forehead. "The vibrations of thousands and thousands of hooves with horseshoes constantly striding the ground will make leaves fall on a daily basis! Trees won't grow fruits, it will be winter all year, provoking the worst drought ever witnessed since a thousand years!"

This time both mares gasped in horror, now feeling horrible the farm mare took off her Stetson hat and put it on her chest as her friend finished:

"So whatever you do, Applejack! Don't throw that horseshoe!"

"I… I'm sorry Twilight. I didn't know." And looking at her friend's appearance: "I didn't want ya to starve…"

"Me?" And Twilight chuckled. "Oh no! I'm just from next Tuesday, bye!"

With those words her horn glowed, a sudden blinding light engulfed her and in a flash the purple mare was gone. Her two friends left behind looked at each other, rather dismayed by what had happened and by the renewed silence of the farm.

Applejack weighed the horseshoe on the toe of her hoof. "I don't wanna cause a drought!" She exclaimed, and Rainbow Dash at her side nodded, then grinned.

"So…" The fiery pegasus said, "you forfeit?"

The earth mare looked at her friend, shocked then defiant: "Oh ya're on!" She threw the horseshoe, and won.