(Nothing here is mine to own. ^^ First fanfic, was bored, got this crazy idea, and then it kind of happened. Great? Great.)

Hanji. Experiments. Hanji and experiments.

Two things that DO NOT belong together.

Said crazy titan-loving scientist had taken time out of her 'busy schedule' just for Eren. 'Just for Eren' means 'for her crazy experiments'.

Of which she wanted him to be a part of currently.

Said green-eyed teen stared at Hanji, a flash of terror reflecting off of his irises as she neared him menacingly with sedative.

"Now now, Eren, this won't hurt a bit." She murmured with a low voice and a crazy smile, before quickly-yet carefully-peircing the tan skin of his arm with the needle.

Eren gave a cry of protest, his vision blurring nearly right after as Hanji giggled. "This will be perfect~!"

-Timeskip? Yes, Timeskip.-

When Eren woke up, he reached up to rub the sleep from his heavy eyes. They never reached, though, for his hands were shackled, the chains clanking loudly as they pulled his arms back. Eren gave a yelp of surprise before observing the area around him.

"What happened...?" He blinked a bit to get rid of the remaining blurriness from his eyes before it dawned on him.

"Hanji." He gave a groan, and reached up to pinch the bride of his nose before yet again being held back by the shackles.

'Speaking of whom, where is she-' Eren didn't even get to finish the thought before Hanji burst in with a bright smile and flushed cheeks.

"Are you awake yet? GREAT! Let's get started!" Hanji said in a rush, making it painfully obvious to the green-eyed boy that she was really excited about this experiment.

"Wait, Hanji, wh-."

"You see, Eren, I have come up with the perfect idea! See, I figured something out with this metal, and it's storming like a b!tch out there, and I want to see what would happen if you got shocked by lightning! What if it turns you? Isn't there always lightning when you turn?" Hanji interrupted him once again, though verbally, and burst out with as much excitement as a dog with a well-cooked steak.

Eren looked hesitant to comply without struggle. He pulled at the shackles once more, discovering some around his ankles as well, before giving a sigh. "Is this safe though..?"

"Your titan abilities will heal you if anything goes wrong, now just stay still..." Hanji proceeded to hook up a cluster of wires to the poor boy, who only responded by struggling a bit, and observing the wires with his eyes. There was obviously no clue to him what they would do, and what they were.

When she was finished, she put a metal hat on him. He looked up as much as he could at the hat, before she opened a lever that somehow magically opened the ceiling.

"What the...?" Eren realized that he will never, ever be able to predict Hanji's actions, words, and now even her workspace and ideas.

"Just wait for it..!" Hanji stepped back, a bright smile on her face.

Just then, a certain shortie walked in, mumbling in an annoyed tone. "Hey, four-eyes, where's Jaeger? He's supposed to be cleaning, and he did a sh!tty job on the room I-"

Just then, lightning struck. It was bright, brighter than Hanji was expecting. She gave a cry-somewhere between excited, happy, or in shock-before looking to see the results after recovering.

Her smile faded as her eyes travelled to Levi, who had crumpled to the floor. "What... what happened..?" She began to question herself, before Eren gave a grumble from the table.

"The h3ll...? How did I end up here?" He groaned with the same annoyed tone heard previously, but... wasn't that from Levi?

Hanji believed she needed her ears swabbed, that she was just hearing things. But she was once again shocked.

"Why am I strapped to a table? What did you f#ck up this time, four-eyes?" Eren shot her a deadly look. At least, she was hoping it was Eren.

She then looked over at Levi's crumpled form, which groaned and slowly began to sit up, before speaking in an innocent tone. (As innocent as Levi can sound.)

"Hanji.. what happened to me..?" Levi slowly stood up, a fearful look in his eyes. "Why am I so short?"

And it was then that Hanji realized that Levi and Eren switched bodies.

She gave a scream of excitement. "THIS IS THE BEST EXPERIMENT YET!" Before fist pumping the air, earning an annoyed look from one, and a bewildered one from the other.