James, Sirius, Remus and Peter skulked down the dark corridors late one night, their wand tips glowing faintly. Sirius glanced down at the piece of parchment and whispered to his friends, "Filch around the corner!"
The gang of four quickly threw James's invisibility cloak over them and put out their wand lights, backing up to the wall hurriedly. Filch came strolling around the bend, looking around cautiously. "Could've sworn I heard somebody." He muttered, and continued on his way, still casting glances around the corridor.
A few tense moments after Filch was gone, Sirius glanced at the parchment again. "All clear." He whispered.
"T-That w-was s-so c-close." Peter stammered.
"Don't tell me you're getting cold feet." James huffed. "This will be our greatest trick this year. All we need to do is get the last ingredients from the Slug's storeroom, make the potion…"
"And slip it into Professor Whitman's butterbeer!" Remus finished.
"You got it." James said with a grin. "Now, let's go."
The Marauders continued sneaking down the corridor until they had reached the door to the dungeons. With extreme caution he turned the handle, all the while glancing at the map in his hands. The door swung open noiselessly.
"Good thing we oiled it." Remus muttered.
"Okay Peter." Sirius said, turning to his friend. "Go in and get the stuff we need."
Peter nodded and began shrinking, his features becoming more rodent-like. Once he was fully transformed, he scurried into the storeroom.
James, Sirius and Remus waited anxiously, finally breathing a sigh of relief when the rat came back out with a shriveled weed in his mouth. James stooped down and took the plant from Peter's mouth, and Peter turned back into a boy. "That tasted awful!" he hissed.
"It'll be worth it when the potion is made." Sirius retorted. "C'mon, let's get going."
The next day, there was in uproar in Defense Against the Dark Arts Class.
At Professor Whitman's desk sat a rather grumpy looking Koala, with both the Transfiguration teacher and Professor Slughorn frowning over it, while the students were roaring with laughter. James, Remus and Sirius were laughing so hard they had tears in their eyes, and even the normally timid Peter was guffawing.
When class was dismissed – much earlier than usual – James grinned mischievously. "Croikey!" he said, putting on an Australian accent. "That was a Furry Pygmy Professor! I wish I'd had me net!"
"Stop!" Sirius shrieked through his laughter. "My sides are splitting from all this laughing!"
Remus grinned. "That was great!" he said. "So, what are we doing next year?"