Continue the story in one sentence

[Rainbow Eclipse 3,927]

Also, Pinkie was found guilty of never once brushing her mane, so she was sentenced to conversion into a plushie of herself.

[Commander Hurricane 170]

And then Big Mac ate a pizza.

[Rainbow Eclipse 3,927]

Actually, he would have eaten a pizza, had the pizza not turned out to be robbing Sweet Apple Acres.

[DigitalRocket 185]

but of course this made him angry so he leaped at the pizza and started stomping on it like it was a spider

[Rainbow Eclipse 3,927]

Luckily, Apple Bloom turned out to be an undercover cop, and Big Mac was to be arrested for the killing.

[CMQuickfireTK 751]

Big Mac, being arrested, realized that the undercover cop was being very negative in the freedom dimension.

[Enigma Stitch 51]

The thread comes to a screeching halt.

[CMQuickfireTK 751]

In a flash, Big Mac escapes, realizing that he is free, yelling, "eeyup!"

[Cwanky 17,643]

Inexplicably Doctor Who came to restore the status quo, but not before accidentally leaving Lyra be beaten by a drunk Chris Brown, permanently scarring her and her love of all things human.

[Enigma Stitch 51]

The forum halted again but this time your greatest fears stand guard to keep it that way.

[Rainbow Eclipse 3,927]

Anyway, as for Big Mac, the police eventually caught up with him, and he was charged with "murdering a pizza". The charges were dropped when everypony realised how completely stupid that sounded.

[Sleipnir Rising 115]

Later that same day, Big Mac won the lottery.

[Loriem 639]

However, he was taxed 98% of it, and the other 2% was eaten by a brick.

[StarSwirlTheBearded 356]

The brick proceeded to steal his sanity.

[Twilight The Creator 298]

Therefore, the brick became the bane of our existence, the Breezies.

[Proton 565]

The brick then left to Hawaii, where he would meet his lover, a concrete block.

[Twilight The Creator 298]

The concrete block turned out to be Princess BigMac in disguise. 

[Cwanky 17,643]

A butler came out seeing the site inquired, "would you like some cheese with that sir?"

[Proton 565]

The brick brutally punched the butler until the latter's life had faded away.

"I'm lactose intolerant," the brick said.

Edited March 19, 2014 by Varus

[Severed Dog Head 23]

And then the brick ate bacon

[Rainbow Eclipse 3,927]

The bacon revealed it was an undercover cop

[Adorkable 2,737]

The bacon showed its badge that blinded everyone within a hundred mile radius because it was so shiny.

[Rainbow Eclipse 3,927]

Causing Rainbow Dash to walk off a cliff, as karma for being mean to Pinkie.

[Cwanky 17,643]

She tried to fly away, but got a wingboner at that moment about Maud Pie, rendering her wings stiff and helpless plummeting to her doom.

[CMQuickfireTK 751]

While plummeting to her doom, she somehow entered a new world...