The Common Room Chaos – by Minerva McGonagall
When Harry and Ron tiredly dragged themselves down the stairs from their dormitory, they were shocked by not finding themselves in the Gryffindor common room, but that of the Slytherin's.
"Ron?" Harry asked hesitantly. "Does this room...err... does it look normal to you?" 'Maybe I'm delirious,' he thought worriedly. 'We just came down the stairs from our dormitory, didn't we?'
"No," Ron replied, horrified.
"Good morning," Hermione greeted the two boys as she descended the stairs, and all of a sudden, the common room turned into what appeared to be the Ravenclaw common room. "Oh, that's strange," she said surprised, causing her friends to nod affirmatively.
"At least it's better than Slytherin colours," Ron replied, shuddering at the thought.
"Well, let's head down to breakfast. Someone obviously decided to play a prank on us," Hermione decided, ushering the boys out of the room.
When they returned to their common room after their last afternoon class, the room was back to its normal Gryffindor colours.
"Thank God," Ron said in relief, letting himself sink onto one of the sofas in front of the fireplace.
"Thank God for what?" Ginny enquired, entering the room through the portrait hole, and as she did the room changed into the Hufflepuff common room.
"Oh the common room just looked like our normal one for a few minutes," Ron explained sourly, while the common room quickly changed its colour and form back and forth a few times.
"Wait a moment," Hermione spoke up and hurried up a few steps in the direction of the girls' dormitories and returned.
The room changed to the Slytherin common room. Hermione once more climbed up a few steps and returned, and the room changed into the normal Gryffindor common room.
"Someone has played us a prank. The room changes its colour and form whenever someone enters the room," she stated, sighing.
"I bet it was McGonagall. She looked really mischievous when she left the room yesterday," Harry spoke up.
"Well, then we have to get back at her," Fred and George fell in simultaneously.
"Oh no," Hermione groaned. "I'm not going back to the hospital wing, so that you prank McGonagall."
"All right, then we won't inform you what we're planning to do," the twins said while wearing identical mischievous grins, causing Harry to groan just thinking about what that grin meant.
Shortly before curfew the same evening, the Gryffindors gathered in front a parchment that had been placed on the bulletin board of the common room.
'We advice everyone, who has Transfiguration tomorrow, to wear boots for classes.'
'Oh no; we have Transfiguration first thing in the morning,' Harry mused and nodded absentmindedly when the twins brought him the invisibility cloak back. 'I didn't even notice they had it,' he thought astonished.
The next morning, all the Gryffindors appeared in the Great Hall all wearing boots, causing the Headmaster to chuckle.
He turned to his Deputy Headmistress and asked, "What are your Gryffindors up to now?" She in turn threw one of her most intimidating glares at her House table.
"I have no idea, Albus, but let me tell you now that I won't tolerate this prank war continuing. The problem is that it seems as if the whole House was involved in this. At first I thought it was the Trio, but the last time a prank was played they were in the hospital wing, and I found the whole House watching the effects, of the prank with the cows in Slytherin, on a big screen that had been set up in the common room. I don't know what to think anymore."
"A little bird told me that someone obviously played a prank on your House as well, Minerva, depriving them of their most beloved common room," Dumbledore replied, smirking.
"Well, I just hoped it would show them the feeling of finding themselves on the receiving end of a prank," McGonagall replied in annoyance. "But obviously, they didn't learn anything from it, and therefore, I'm not going to cancel the spell just yet."
Twenty minutes later, the Gryffindor and Slytherin fifth years headed towards the Transfiguration classroom, stopping dead in their tracks as soon as they entered the classroom.
"What's that?" Hermione shrieked, who was walking right in front of Harry.
"Sand?" Harry asked incredulously, before he felt himself being pushed into the room by the group coming up behind him.
The whole classroom floor had vanished, being replaced by sand. "Well, it could be worse. Why did we need boots for sand?" Neville asked, taking a seat in the first seat that was available closest to the door.
As soon as Professor McGonagall entered the room the students noticed that her mouth stretched to the thinnest line they had ever seen on her face. McGonagall waved her wand around the floor mumbling an incantation, and the sand vanished – only to be replaced by a swamp. She tried another spell, and the swamp turned into flour.
"Maybe you could try transfiguring it into the normal floor?" Hermione suggested, causing the teacher to throw her a murderous glare when the floor did nothing but change into rice.
When Draco Malfoy pointed his wand at the ground and tried to change the floor back, the classroom floor changed into a carpet of grass, and the professor exploded.
"All Slytherins are dismissed. The Gryffindors will write a three foot long essay about the reasons why you do not play pranks a month before OWLs; it is to be handed into me tonight at dinner. Go back to your common rooms," McGonagall ordered the students in a dangerously quiet voice and headed back to her office.
"Wow, that was not as big of a success as the twins thought it would be," Hermione stated on the way back to their ever changing common room, where they began writing their assigned essay.
All the other Gryffindor classes were given the same punishment, even the first years, whom the older students took pity on and helped them after their afternoon classes.
By the time Harry and his House mates entered the Great Hall for dinner and handed over their essays to their Head of House, the Transfiguration classroom still wasn't back to normal, and Professor McGonagall was wearing an extremely angry expression.
Between the main dish and dessert, the Headmaster rose from his seat and announced, "During the last four weeks of the school term, all Gryffindor students are grounded. That means that you will only be allowed to go to your classes. After classes, you are to return to your common room, where you will spend the rest of the day. You will also have all of your meals in your common room. If you need your Head of House, or Madam Pomfrey, or me, you may contact us through the fireplace in your common room. If the fifth or seventh year students need books from the library, they may contact the teacher responsible for the subject they need it for. Please go back to your common rooms now. If you behave, you'll be allowed to attend the Leaving Feast."
All the Gryffindor students rose from their seats and headed for the door, while Professor McGonagall's hat changed to a bright yellow one that sent sparks into the air above her and formed the words, "Minnie loves pranks!"
Thanks to Mushcorn for her brilliant beta-ing! Thanks to all the kind readers, who reviewed this story!
All recognizable characters belong to J. K. Rowling, and I am not earning anything by writing this story.