Rainbow Dash landed with a metallic clunk on the solid floor of her cloudy home, and removed her helmet. "Ahh," she sighed, "Another day of crime-fighting awesomeness for the Iron Pony. It's too bad everypony left after the oatmeal factory exploded though; nopony even got to see me when I beat down that oatmeal beast. Oh well, at least they got to see me fry that cake dough monster." She chuckled to herself, taking a few heavy steps toward her closet. "For now, though, this superhero needs a little rest.
She pressed a hoof to her body in a few places, and her armored suit made a hissing noise as the plates separated and fell from her furry body. She collected the parts for her rainbow-colored power armor, stowing them in the closet next to her old Shadowbolt costume. She shut the closet a moment later, and walked off to make herself a nice, healthy sandwich.
Unbeknownst to the Iron Pony, a pair of golden eyes were watching her from a nearby window. Well, one of the eyes was. The other had been pointing at the ceiling. Once Rainbow was out of the room, Derpy awkwardly climbed in through the open window. Her body slung low, she crept across the floor, a sinister smile on her gray face. She slid the closet open with barely a squeak, and half-gazed at the gleaming metal armor inside. Derpy reached into the closet.
Rainbow returned a few minutes later, a totally-non-healthy donut hanging from her mouth, heading to her bedroom mirror so she could watch and admire herself while she ate. She stopped dead upon finding that her closet was open and her suit was gone, the donut tumbling from her mouth and dispersing sprinkles all over the floor. "Wha...."
The sound of jet engines revving up reached her ears, and she whipped around. There, on the rapidly-being-crushed window sill, was somepony stealing her suit. "Who... Derpy?!"
"I am the Iron Pony!" Derpy squealed as she kicked on her new afterburners and shot out the window. "Woohoo!"
Derpy sailed across the sky, going in a straight line for once in her clumsy life. She spread her hooves out, taking in the glory that it was to have stolen a superhero's super suit, and accidentally blasted a house apart with one of the suit's built-in missile launchers. "Oops," she squeaked. "Sorry!" But the pony she'd blasted couldn't hear her. Not because she was dead, but because she was out of town on vacation in Saddle Arabia.
Derpy rolled, performing a split-s maneuver and diving down toward the ground. It was time to get to business. She didn't even bother using the front door, choosing instead to smash right through the store's rooftop. Sadly, she went right through the floor, too, and landed somewhere in the basement. After a brief battle with what she could only assume was a giant, land-based lobster that the shopkeeper had been keeping as a pet (which was probably illegal), she returned to the shop's main floor. She directed one of her hoof cannons at the store owner and demanded, "Gimme all your muffins!"
The store owner, looking bored and more than a little annoyed, pointed to the sign above the counter. Derpy, who already had an eye pointed at it anyway, looked at the sign and realized that she wasn't in the Muffination, Ponyville's premiere muffin emporium. She was at Quills and Sofas, which probably didn't have an muffins at all.
Meanwhile, Rainbow was figuratively rocketing through the sky after Derpy and spewing a string of incensed obscenities that would surely have made Rarity faint on the spot (not that it would be terribly difficult). She caught up to the walleyed mare quickly enough, partly because Derpy wasn't doing a good job of hiding her trail and partly because she's Rainbow Dash. She swooped down through the closed door of the sofa and quill shop, blasting it clean off its hinges, and slid to a halt behind a disappointed Derpy.
"Alright, Derps," Rainbow growled. "End of the line."
Derpy turned around. "Aww, but I was just getting started!" She pointed a hoof at the shopkeeper, who ducked to avoid a blast of non-specific energy as it shot from her hoof and punched a hole in the wall. "And he didn't even have any muffins!"
"Too bad! Gimme my suit back."
Derpy narrowed her eyes, half-glaring at Rainbow. "Make me."
Dash hopped forward and poked at Derpy with lightning speed, punching the Iron Pony suit in a number of places. The suit then fell apart around Derpy's hooves, and she slumped to the floor. Rainbow swiftly gathered up her suit and headed for the door, only stopped at the sound of Derpy's sniffling. She groaned, turning around just to be sure that—yep, Derpy was crying.
Rainbow sighed, taking a step toward the weeping mare. "Alright, you can play with my stupid suit."
Derpy jumped up, eyes bright.
"But stop blowing things up, okay?"
Derpy nodded, and Rainbow helped her get back into the suit. Together, they figuratively and literally rocketed out of the sofa shop, punching another pair of holes in the wall.
Davenport, the shopkeeper, finally came out from behind the counter to look at the remains of his store. To his surprise, none of his stock had been damaged. He was about to sigh in relief when a horrible noise reached his ears.
"Scrappy?" he asked tentatively.
The mighty land-lobster burst forth from the basement, tearing open the hole in the floor and smashing its way out of the shop.
"Scrappy, no!"