"Wake up, sleepy head!" Pinky exclaims.
"Hmm?"
Rainbow Dash wakes up in a giant room that looks like one of Twilight's science labs. It's a very concealed area, abundant with test tubes, chemicals, papers, computers, and a giant machine which has two entrances that lead into a small chamber.
"Um, excuse me, but so you mind telling me where I am?"
"You don't remember? You swapped brains with Rainbow Dash, silly!"
"Wait, what?"
She looks to the left and sees Fluttershy's body laid across a bed simaler to the on she was laying in. Twilight stormed into the room, hyperventilating.
"ARE THEY OKAY?"
"Calm down, Twilight, they're fine!" Pinky said with glee.
"They've only been out for 10 minutes, not that big a deal."
"Okay, good. It's odd though, their heart beats were off the charts on the Computer. Anyway, is rainbow still asleep?"
"Yep! It looks like she might wake soon, though."
"If it isn't too much trouble, could you please explain what's going on?" Fluttershy questioned.
"Certainly. Last night, I learned how to switch the minds of two living objects, but I needed somepony to test it. I tried it first with two birds, and was successful. Then, I tried with Spike and Owlicious, and was successful again. Finally, I needed to test it with 2 ponies. When I told Rainbow, she jumped to the idea and wanted to test it right away. So, to ensure maximum success, I wanted her to switch with her polar opposite: You."
"I see. So, umm, can we trade back now? This feels weird."
"Unfortunately not. It takes 24 hours to recharge, so you'll have to wait until then."