Just an idea.

"Here Derpy, I think I see the muffin recipe book over there" Twilight said pointing to a nearby shelf.

"Spike, can you go get that book for Derpy?" Twilight asked.

"Sure" Spike said as he climbed up the book shelf.

Unfortunately it made the whole book shelf fall down , on Derpy.

"Ahh!!!" Dery said. Then silence.

"SPIKE HELP ME GET HER OUT" Twilight yelled.

They had both cleared the books away. Spike had gotten a first aid kit.

---somewhere else-----------

"...AND ZAT,  My dear friend Veginar , is how I faked my death, what was your story, you got frozen in ice by a blizzard?" I said, as I finished my tale, apearently he had fallen asleep after I told him how i wondered what a beam of light would like like if you ran alonge side it.

"...well.....I'm going to get some sleep now" I said as I headed to my room of R.O.S.   ROS is a secret organisation , it stands for  Retirementhome of Scientists.

Basicly, famous scientist fake their death and work/relax in peace, away from the public.

I headed over to my room , which had "EINSTEIN"  engraved on the door.

I walked over and lay down in my bed and thought"Tomorrow I think I'll go and find Steve Jobs, I would enjoy his company as much as he would mine.

"Just hope he doesn't pull a "genius bar" joke" I thought as I drifted to sleep.

-----Back to MLP---------

"AUHHH" was heard from under the books.

Twilight had finally cleared away all the books.

"Are you ok?" Twilight asked.

To the face down Derpy.

"I think, but how did I end up under all these books?" I asked.

Then I looked up.

"ahhhhh who they hell are you!!!!" I yelled as I saw a purple pony.

"Derpy!!!" Twilight yelled.

"WHAT?" I yelled back.

"WHAT THE HELL HAPPENED TO MY BODY!!!" I yelled as I looked down.

"Derpy!!!, I think you have amnesia, amnesia is when-" she began in a voice you would talk to a stupid person In.

"Im not a simpleton" I said.

"Well your not the Brightest bulb In the carton" Twilight said , she than realized I used a "big" word.

*rap voice*

"Cuz im not a bulb ima photon , a quanta of light, my mind out shines the sun while you can't even fight, I goin so fast I'm energy , I'm  hangin with the muons and the string theory,

If  the cat in the box could have talked , it would have simul-taneous  dissed you and beet you in rap"  I rapped.

"What??? DERPY!!!,  YOUR NOT THAT SMART!!!" Twilight exclaimed.

"That's cuz I'm not Derpy I'm Albert Einstein" I said.

"SPIKE COME QUICKLY!!!" Twilight yelled.

Spike quickly ran in.

"Whoa, never seen your eyes straight before, Derpy" Spike said to me.

"That's because I'm not DERPY!!" I growled angrily.

"Thats what's the problem" Twilight said.

"That's not Derpy" Twilight said.

"Why do you keep calling me Derpy!" I asked.

"Well um, you were  Derpy before the books fell on you" Twilight explained.

"WHAT DID YOU DO WITH DERPY!!!" Spike yelled.

"You think I did that?, why would I want to a) be a horse , b) I'm retired!"

I replied.

"YOUR NOT A PONY!!!" Twilight exclaimed as she got a notebook out.

"I wasn't, but apparently not anymore" I said as I gestured to my body.

"What where you before than?" Twilight asked.

"I was a human" I said.

Spike and Twilight gasped.

"Bu-t humans are myths!!" Twilight stuttered.

"So are horses with genes that don't a cur in nature that allow them to, Talk, be purple, have a horn, have advanced thought" I said.

"What?, but I'm real!" Twilight said.

"as am I" I said back.

"Where am I any way, in a library?" I asked.

"Yes, Ponyvilles only library!" Twilight said.

I walked by the science section and said"Meh".

"What don't you like science?" Twilight said offended.

"No it's just thats the basic stuff" I said.

Twilight gaped.

"But that's the most advanced in the field!" She exclaimed.

"Well I'm currently doing quantum physics and nuclear fusion" I said back.

Twilight looked amazed.

"But that's at lest  100 years more advanced!"she said.

"Are you some kind of scientist?" Twilight added.

"Legally a genius" I said with a smirk.

"Wow, spike a think you should sent letters to my friends" Twilight said.

"ok" Spike said and burned some letters.

-----Dos friends---------

------POV o Rambo bash (get it?)--

"I wonder what Twilight wants us for?" I said as I flew above there heads.

"Ya , Rainbow Dash, wunder wut she needs" Apple jack said.

"Well well find out what the dilemma is  in a few minutes" Rarity said as they neared the library.

They knocked on the door and spike let them in.

They were extremely shocked at what they saw. Here was Derpy, the slow mailmare, besting Twilight at science.

"And ZAT is how energy equals mass times the speed of light squared." Derpy said as she pointed to and extremely large and confusing equation on a chalk board with "E=mc^2" under it.

Twilight had the expression of an amazed school child.

Then Rarity spoke up.

"How is this possible, Twilight?" She asked.

"This is the reason you are here" Twilight began.

----POV   A.E-----

"It appears that when some books fell on Derpy,  her mind was pushed to the side and somepony else's mind got pulled in. " Twilight explained.

"Aheam, someone's" I coughed.

"Yes someone's" She corrected.

"WHATTTT???" Rainbow dash yelled.

"Who's in Derpy's body than?" Fluttershy said quietly.

"ZAT would be me, Albert Einstein" I spoke up.

"Albert this is , Rarity, Applejack, Fluttershy, Rainbow Dash, and Pinkie Pie" Twilight introduced quickly.

"Albert? That's a funny name!" Pinkie Pie said.

"Pinkie Pie!" Rarity exclaimed.

"Well Pinkie Pie is a funny name for a miniature horse of unnatural pigment" I retorted.

 "Hey!" Pinkie Responded.

"You talk as if you aren't one" Rarity commented.

"Because I wasn't" I said.

"What!?" They exclaimed.

"Is your vocabulary linited to that?" I questioned.

"Uh, no, Darling" Rarity said first.

"Oh, Where are my manners, I'm Rarity" said pony,said.