The "What If?" game!

Then Celestia would be an ever bigger chessmaster

What if MLP was first a manga?

Then I assume using the elements of Harmony would involve even more dramatic posing and a lot of screaming/Calling attacks.

What if Manga characters all became mute?

Then manga would be filled with even more motion lines for their sign language.

What if manga characters all originated as Western legends?

Fate Stay Night.

What if people got he reference "a sneeze from the weakest Mage would wreck it instantly"?

Then my answer would be a lot more congratulatory.

What if Whiteeyes didn't break the manga combo?

He would have made that exact same post because that is a manga reference

What if Phoenix Wright were to defend a man who thought he was Zeus in court?

It would be a very shocking trial.

What if all gamblers were lawyers?

Then the Mob would have even more lawyers

What if Disney was an independent nation?

Then we'd be in debt to them instead of China.

What if bacon actually tasted bad?

The Jews would be so smg.

What if somebody actually got where I got my quote from right?

Then someone would also get the reference I'm about to make...

What if we changed the traffic signs to a brighter yellow?

My Dad would then mistake them for red, as would a number of other color blind individuals.

What if you had to choose between your grandmother, and Season 4 of MLP:FiM?

Simple both just not at the same time.

What if no one could drink milk or eat any dairy products?

We would spend a lot less money on milking machines

What if season 4 is just a disguised season opener for Equestria Girls?

Then this makes a lot more sense.

What if Equestria Girls turned out all right?

Then it would be about what I expect it to be from the trailer: alright.

Nothing great.

Nothing horrible.

Alright.

What if people shrank whenever they told a lie (but not a lie of omission or leading-on, etc., just a bold-faced lie)?

Then things would become even more complicated for Pinocchio.

What if the last thing you touched (not including your keyboard) suddenly turned to jelly?

Then my headphones would jiggle to the music.

What if we all turned into opossums?

I would still be amazing.

What if we are all actually simulations created by an advanced society?

Then the Matrix is the Hipster's Inception.

What if Equestria was discovered to be real but the Show is completely wrong and everybody's headcanon is completely right?

Then Equestria is the place of lust, drugs and war depending on where you go. (Hey you said everyone head-cannons so that means you have to look at the fanfic writers thoughts on it)

What if the entire mane 6 were replaced with kittens in suits?

then their Cuteness levels would actually lower.

What if there where never any hipsters?

Trolls would be extinct.

What if people knew who Raistland was?

I would not have to use Google (and fail) to answer your question

What if the Dog was the mastermind?

Chris would never let me live it down.

What I'd Michle Bay made a GOOD Transformers movie?