AN: Set around series1-2 before Morgana went evil.

It should be put down on record that Arthur and Morgana had a relationship of ups and downs; the way most siblings do.

When they got along; everything was fine.

When they didn't get along; all hell broke loose.

Today was one of the latter and in one of the corridors of Camelot castle; Arthur and Morgana were yelling at one another. What had started as Arthur boasting about the recent tourney he'd won had turned into an argument over who was the most sly, devious and clever. Arthur claimed it was him; having being raised in battle strategies and warfare. Morgana claimed she had inherited her devious mind from her father and as a woman was born with a sense of deception and slyness. It seemed the only way they would settle their differences was through a prank war. They were not alone; their servants; Gwen and Merlin were standing aside. While Gwen was doing her best to stay out of it; Merlin was offering insults or comments to annoy or assist both sides of the row.

"This means war Pendragon!" Morgana yelled.

"Bring it on LeFay!" Arthur retorted.

As both stalked off to their respective chambers; Gwen and Merlin shared a look before following. Something told them that this was no idle threat; that Arthur and Morgana were willing to literally fight it out to prove their superiority.

"What are you planning to do?" Merlin asked.

Arthur paused in his pacing and grinned. "It's best to start small and build up on the attack bit by bit. We'll have to keep it simple; something she'll never suspect." Arthur replied as he resumed pacing.

"We?" Merlin asked.

"Of course; I'm ordering you to help me." Arthur replied while muttering about whether a bucket on top of Morgana's door or the classic sending false love letters would be the better plan.

"I don't think-"

"Exactly Merlin, you don't think. If I lose this prank war to Morgana; what does that say about me as a leader? No man will believe I can lead them to victory in a battle if I cannot defeat the king's ward in a simple prank war. The implications and outcomes of this war are vital to Camelot's future.

"Uther will go crazy when he finds out." Merlin reasoned.

"What he doesn't know won't hurt us. Besides Morgana would never go crying to him no matter what we do. Now help me work out our plan." Arthur replied as he finished pacing and grabbed a roll of parchment and a quill. Merlin cast his eyes skyward. This was his supposed destiny?

"Gwen I need you to help me. Arthur will never suspect you if you did this." Morgana insisted.

"I'm not sure this is wise my lady. A prank war just seems childish, doesn't it?" Gwen asked. Morgana looked at her friend as through she'd grown an extra head.

"There are more than just a few pranks at stake here Gwen. You know how arrogant Arthur gets if he beats one of his knights or a stranger in anything. What will he be like if he wins this war against us? If Arthur wins the war he'll be completely unbearable and we'll have to live with the knowledge that his arrogance will be because we backed down and I'm not sure about you but I wasn't raised to give into anyone without a fight. Now are you with me?" Morgana asked.

Gwen looked at her friend and nodded. They were going to be in so much trouble for this but Arthur's arrogance was not something to be enjoyed and the threat of knowing she was responsible for it was not something Gwen wished to experience.

"Alright; what's the plan?" Gwen asked.

AN: What do you guys think? I'm not too good at thinking up pranks so all ideas will be welcomed. Happy New Year, let's make 2012 unforgettable!