Kind of rushed this one, but this idea would NOT die quietly.
Bathroom Confusion
Wario walked down the hallway that led to the public restrooms of Mushroom Mall. Soon, he reached two doorways for the bathrooms, one labelled M and one labelled W. Mario suddenly came sprinting down the hallway in a hurry, clutching his stomach tightly as ran straight past Wario and into bathroom with the M label. Wario looked up at the signs above him. In his mind, M stood for Mario, while W stood for Wario. He chose the W bathroom on his right and walked inside, whistling. A screech came from behind the door, and a Yoshi with a police cap ran straight inside the bathroom, soon dragging a knocked-out Wario out with him.
IN THE MUSHROOM COURT LATER THAT DAY...
"That's how I ended up here." Wario muttered, his hands cuffed while he sat on the benches outside the the main courtroom.
"Yeah, that's also what happened to me as well." said his brother, Waluigi.
"Same here." Said Wiggler.
End.