Midnight, Hogwarts School of Witchcraft and Wizardry.

The Death Eaters marched up to the gate, slowly, with a sense of righteous purpose. Mulciber, Dolohov, Rookwood, Macnair, countless others… the Dark Lord was still seeking Madam Lestrange, who could not be found yet; although rumours abounded that she had been killed; but no matter.

Hogwarts would burn tonight.

As the little army of Death Eaters marched towards the main door, they were surprised to see the door open, and a single figure face them; a figure dressed in a suit with a long coat, wearing face makeup. This man held various metal devices that looked vaguely like weapons in his hands, and as the Death Eaters approached him, he looked up.

"A friend of mine," he shouted at them, "once said that Muggle stuff doesn't work in Hogwarts."

The Death Eaters ignored him and raised their wands, ready to strike him down. He raised his own weaponry, and suddenly a hail of lead flew into the ranks of Death Eaters, and they fell asunder in confusion.

"Somehow, I don't think she ever thought of these!" the Joker laughed, as he emptied the first set of guns, and drew out his Bazooka...

--

Ten minutes earlier.

When he arrived, Kingsley Shacklebolt was making plans.

"Hello!" Luna Lovegood smiled, waving at him. He waved back, but he kept walking towards the main podium where Shacklebolt was. The various people turned to look at him, none of them showing any surprise or wonder at who he was (obviously, the family had been blabbing) but his father looked shocked and his mother looked away from him.

"Hiya all," he said. "Heard there was a party brewin'."

"What are you doing here?" his father demanded of him.

"Well sorry, pops," he said, sarcastically, "but I heard I was needed. Heard, more specifically, that there were Death Eaters around."

"There will be soon," Remus Lupin said. "We have until midnight top plan our battle..."

"Bah," the Joker said, waving his hand. "I hate plans. I mean look at me - I'm the Clown Prince of Chaos..."

"What?!" Mr Weasley yelled. "What did you say?!"

"I'm," the Joker said, slowly, emphasising every word, "the Clown Prince of Chaos. Means Anarchy is my thing. And I hate plans - I really do."

"Alright then, Mr Clown Prince," said Kingsley, walking down the podium and holding up his hand to silence an angry Mr Weasley - although his own voice suggested he was at least as angry as his friend. "What do you suggest we do to stop the Death Eaters then?"

The Joker looked right at him, and smiled - it was a grotesque thing, which quite frankly scared the shit out of Kingsley.

"Leave that to me." he said. "Just make sure you keep the kiddie winkles back from the action; it'll get kinda messy..."

--

"Messy" was not the word. The Joker was going all out on this one - and that was without the wand. He had emptied almost every weapon he had (apart from one assault rifle he had given to Luna Lovegood on request) and then using his bazooka on Giants. The fact that from the windows every single fully trained wizard was sending a dozen speels a minute out to cover him was helpful of course, and he appreciated it, but (quite frankly) he felt they were kinda cramping his style.

He knew that he could only delay them a short while, so when he finally ran out of violent Muggle weapons (apart from his knife) he took out his wand, killed the next Death Eater he saw, and legged it up the stairs from the entrance hall, dozens of Death Eaters following him; only to be taken out by a swarm of Order of the Pheonix members and a handful of teachers. On the way up, he passed Harry, who ignored him (fine) and

He ducked a green jet of light and ran into up a set of stairs as a half dozen Death Eaters followed. He turned a corner, only to be pushed roughly aside - as a figure in a black and red quartered jumpsuit emptied a hail of bullets into the charging villains.

"Ha!" he yelled as Luna Lovegood - fully dressed in her Harlequin gear - turned and smiled at him. "Looking good!"

"Thanks," she said. "That was quite fun."

"That ain't the half of it," the Joker promised. "Come with me."

--

At the top of the Grand Staircase, he looked down on a hoard of fighters at the foot of it.

"We expected some people on our side to die, right?" he said.

"I think so," Luna confirmed.

"Right," he smiled, and he held up a canister of C4. "So no one will notice if a few more die, will they?"

Luna grinned and he dropped the canister, which sailed downwards gracefully, and landed with a bang.

It exploded a second later, to hoots of laughter from the Joker and Luna.

"This is too much fun!" the Joker laughed. "Just too much!"

"It isn't over yet," Luna said. "Come on - I wanna see if Giants like C4!"