Disclaimer: I don't own any of these guys in my story, OK? OK. Glad that's sorted out.
One day, Wario was at home. He was thinking about the treasure he had just bought. The guy who sold it to him had called it an Arwing. He had warned Wario to be very careful with it. "Bah!" Wario had said, and paid for the treasure.
Well, at this very moment Wario was in his favorite armchair thinking. He wanted to see what the Arwing did, but he didn't want to get cursed. Treasure usually curses you, you see. Wario ate a garlic covered pie, thinking. He really wanted to try it out. Suddenly, there was a knock on the door. Wario went to answer it.
A voice came through the window. "Open up, Wario! I'm back from shopping, and I want a word with you!" It was Waluigi, Wario's brother. Wario let him in. "What's up, Waluigi?" Wario asked.
"You should ask! I've been looking for you! I just saw this guy who said you bought something from him!"
"Yeah, I did. He called it an Arwing."
"Well, I've been investigating, and I found that some guy's been lifting ships from planet Corneria."
"Where the heck is Corneria?"
"Up in the sky, moron!"
"So what does this have to do with me?"
"Idiot! That's a spaceship you bought!"
Wario thought for a minute.
"Well, let's go for a ride!"
Ten seconds later, Wario and Waluigi were soaring in the sky, shooting down birds.
"WAHAAAAAA!" Wario bellowed. "THIS IS GREAT!"
"GO OVER THERE AND LAND ON THAT THING THAT LOOKS LIKE A SPACE-TIME WARP!" Waluigi roared.
They dipped to a swirly thing that looked like a space-time warp. Soon, they found that the reason it looked like a space-time warp was because it WAS a space-time warp. They zoomed through a colorful tunnel, landing on top of a factory.
"Well, this is a fine mess you've landed us in," grumbled Waluigi.
"You're the one who said we should land on the warp," Wario retorted.
He started to say something else, but quickly stopped. A guy wielding a baseball bat passed by, followed by a police car and some generic thugs.
"Oh man…" Wario breathed.
"What?" Waluigi asked.
"We're in Streets of Rage." Wario said, his face blanching.
"You, Axel!" yelled a voice, making the Wario Bros. jump.
"What, Murphy?" the vigilante yelled back.
"There's some weirdos in a spaceship on top of Mr. X's factory over there!" The policeman was talking to the vigilante while gesturing toward the Wario Bros.
"AGGGH!" yelled Wario. "Hit that button on the dashboard!"
Waluigi hit the button. At once, a bomb flew out of the nose of the Arwing and into the factory.
"RUN!" yelled Waluigi, and throttled the ship into the sky. They traveled away from the exploding factory and into another space-time warp.
They jetted through another tunnel and landed at the foot of a mountain. A dwarf in green carrying a large axe raced past them.
It was Waluigi's turn to blanch. "We're in Golden Axe, now."
"This is ridiculous!" yelled Wario, and hit the "Get me out of here!" button. The Arwing flew back to the Mushroom Kingdom, landing in the kitchen in the Mushroom Kingdom's best restaurant, Toadetteland. So, the Wario Bros. went home, hoping that tomorrow they'd be able to get a better treasure than that Arwing.