Willy Potter was on guard duty. It had been a long night watching the borders of Hogwarts. It had been a while since a filthy muggle had attempted to enter Hogwarts School of Witchcraft and Wizardry, but they could not let their guard down. The potential damage a muggle could bring was unacceptable. Willy Potter knew the weight of his responsibilities and followed his instructions dutifully. He was coming down from the watch-tower to arouse the next shift's guard when he spotted it. Footsteps. The smell of muggle was apparent even from the top of the watch-tower.
Willy flew down on his broom towards them, not wasting any second. He tracked them but found they ended at a girded sewage escape. The smell of muggle erupted from it, hardly being distinguishable from the disgusting trash in the area, so akin in similarity. Willy knew what this meant. A muggle had gotten into Hogwarts, School of Witchcraft and Wizardry.
...
Bun Weasley had a restless night. He was haunted with nightmares of He-Who-Must-Not-Be-Named. Bun Weasley was walking around the halls of Hogwarts to get a drink of magical spring water. "Man I'm thirsty, wish I had a spell for this! Maybe I'll get a peek at Luna LadyGoo's feet tonight while in the halls of Hogwarts! Eggs dee!"
Approaching a turn in the hall, his nose was suddenly assaulted by a foul smell, similar in type to Luna LadyGoo's feet, yet far less appealing. It was almost like...muggle. But surely no muggle had gotten in? Willy Potter was standing guard tonight. Surely Willy Potter, the greatest and most incredible wizard of all time, hadn't failed so miserably as to let a muggle into Hogwarts School of Witchcraft and Wizardry, a blunder that hasn't happened in over 1,000 years!
Bun Weasley braced himself and turned the corner. A wretch of filth stood before him, covered in trash and feces. Whether the traveller's canopy was due to his journey through the sewers or just normal coverings in the muggle world, is unknown.
He couldn't believe what stood before him. Bun Weasley was visibly shaking, but was filled with a sense of justice. He had to fix Willy Potter's error. Gripping his wand, Bun Weasley shouted, with his voice slightly trembling, "EXPELLIARMUS", disarming the muggle, and with a quick "CRUCIO", the filthy, putrid muggle was tossed to the ground. Bun Weasley walked towards the disgusting creature and put its miserable existence to an end in one magical, fell swoop.
Let this be a word of warning to all putrid muggles of the mortal plane: All muggles who attempt to enter Hogwarts School of Witchcraft and Wizardry will be magically slaughtered. Willy Potter, the greatest and most incredible wizard of all time will be ready. And he is waiting.
https://www.youtube.com/watch?v=3s9YX60hvuc
