This is the story behind:
RULE 353
"If you see Tony Stark run by, chasing Bucky Barnes while dressed as Inigo Montoya, report him immediately to Director Fury, and then run."
"There was no tactful way to phrase the current situation, Tony was drunk...again. And he was watching the Princess Bride."
Export from official report of Director Fury.
Ever since Tony had discovered the true cause of his parent's death at Bucky's hands, he had retreated to his rooms with all the liquor he possessed.
He never left his bedroom, not even to go down to the labs, and he wouldn't talk to anyone but Bruce and Pepper.
Steve would bring him his meals, but Tony never spoke to Steve.
Pepper was with him this night, she had brought a movie and a platter of sharwarma, and they curled up on his bed, eating and watching the film.
Pepper had already fallen asleep, but Tony stayed awake, and started on his third glass of wine.
By the middle of the movie, he was completely and utterly intoxicated.
Through the haze of liquor, Tony managed to hear some of the dialogue in the movie.
"Hello! I am Inigo Montoya! You killed my father! Prepare to die!" someone shouted on the TV screen.
"That sounds like a good idea!" Tony drunkenly slurred to himself. He stumbled off the bed and out his of door. He lurched down the hallway and towards the elevator, and took the elevator to Natasha's floor.
If Natasha was surprised to find Tony knocking her door so late at night, she didn't comment. At least the billionaire had come out of his room.
"Nasha...can I borrow one of your wigs?" Tony chirped. Against her better judgement, Natasha loaned him the wig that he wanted. A black-haired wig with long curls, that Natasha sometimes used in her disguises. Tony took the wig and went back up to his bedroom, while Nat hastily called Fury.
Back in his room Tony dug some choice clothes out of his closet, boots, dark pants, long sleeved shirt, and a vest. He donned the clothes, and placed the wig on his head. He stood in front of his mirror for a while, brandishing a plastic take-out knife and flipping his fake hair.
Finally he left the room again, and made the journey to Bucky's room.
Bucky opened his door to find a drunken Tony standing there, waving a plastic knife at him.
"What the hell is going on?" Bucky demanded.
"Hello! I am Inigo Montoya Stark! You killed my father! Prepare to die! Tony shouted, lunging at Bucky with the plastic knife.
Bucky kicked at Tony's legs, sending the billionaire sprawling to the floor, and then turned and sprinted down the hallway towards Steve's room.
A quick glance into Steve darkened quarters told Bucky that Steve wasn't in there. Bucky ran straight past the rooms instead, with Tony in hot pursuit.
"Do you even care that it wasn't really me who killed your father!" Bucky yelled over his shoulder, as Tony attempted to stab him.
"Just play along! " Tony screamed back, throwing his plastic knife at Bucky.
Bucky swore in Russian and pulled out a very blunt pencil from his pocket.
"I am Count Rugen, I killed your dad, fight me" Bucky muttered awkwardly, holding out the pencil like a sword.
(Thanks to Natasha, Bucky had actually seen the movie Princess Bride.)
Tony grinned, and retrieved his plastic knife. And the chase began again.
Tony and Bucky ended up in Stark Tower's huge kitchen, Bucky jumped up on a counter to gain leverage as Tony slashed at him with the plastic knife. The knife hit Bucky's arm and snapped in two.
Tony was flabbergasted at the loss of his weapon, Bucky however, jumped off the counter and began to walk away...until Tony ran at him, pushing him against the counter.
"Get off!" Bucky growled, swinging at Tony's head with his metal arm, but Tony ducked, and Bucky punched through the humming microwave.
The subsequent explosion blew out the roof, and was heard from miles away. It also knocked the dueling pair unconscious.
When Tony and Bucky woke up, they were greeted by a very angry Nick Fury.
"YOU DUMB-ASSES!" Fury roared, ripping the wig off Tony's head. "WHAT DO YOU HAVE TO SAY FOR YOURSELVES?"
"Eh, why are you here?" whined Tony.
"Natasha called me, she told me you asked for some of her spyware." said Fury. "Spyware, it was a damn wig!" yelled Tony.
"You were using the wig to assist you in attacking your comrades!" Fury snapped.
Tony and Bucky looked at each other, remembering the idiocy of the previous fight. "I am Inigo Montoya Stark! I am avenging my father!" Tony shrieked. Fury sighed, "You mean you were avenging your father."
"I am a great swordsman!" the drunk Tony persisted. "You were trying to kill me with a plastic knife" Bucky reminded him. Unexpectedly, Tony burst into hysterical laughter.
"Steve!" Bucky called frantically, now absolutely sure that the billionaire was crazy.
Instead of Steve, a wrathful Pepper Potts came stomping through the kitchen doors. "Tony, what did you blow up THIS TIME!" she hissed. "Just the microwave" Tony mumbled.
"That was a gift from my mother!" Pepper yelled.
"Bucky! Are you okay!" Steve called.
Clint slid in with straw and feathers in his hair, "Who blew up my nest?" he said.
From far away the Hulk's voice could be heard, "WHY ROOF GONE?"
"DAMMIT TONY!" Fury bellowed.
"RUN, RUN!" everyone else yelled.
Bucky just didn't know anymore.
If you want more Reasons, then you are going to have to let me know which Rules you want me to write about.